Deserts______.

Some desert plant species have a short life cycle of a few weeks that (10)_____ only during periods of rain.

Some plants, such as cacti, (9) _____ water in their stems and use it very slowly …

Since desert conditions are so severe, the plants that live there need to have (8) _____ to compensate for the lack of water.

The temperature also varies greatly depending on the (7) _____ of the desert.

The daytime temperature averages 38°C (6) _____ in some deserts it canget down to -4°C at night.

because the air is (5) _____ dry that heat escapes rapidly at night.

The temperature in the desert can (4) _____ drastically from day to night because the air is….

Most deserts receive less than 300 mm a year compared (3) _______ rainforests, which receive over 2,000 mm.

In fact, the most important characteristic of a desert is that it receives very little (2) _____.

Desert biomes are the (1)_____ of all the biomes.

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He has done nothing to prepare for the final examination, ______ played.

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The first part of the test was easy; the second, ________, took hours.

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Everyone ________ Tom is ready for the discussion. 

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___ hard he worked, he couldn’t earn enough money to support his family.

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________ long it takes, I will wait for you. 

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This is an expensive ________ very useful book.

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To get from Vancouver to Victoria, you can fly;_____, you can also ride the ferry.

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Maria tried to read a novel in French;______, the book was too difficult for her to understand.

: Fill in the blank with a suitable connector (however, but, therefore, so)

He is only sixteen, ______ , he is not old enough to drive a car.

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I must say that you have done very well. ______, you should be aware that you still have a lot of thing to learn. 

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It started to rain hard;______,  we decided to stay at home to watch TV.

Fill in the blank with a suiable connector (However, but, therefore, so) 

We discussed the issue all day;  _____ , we could not come to a final conclusion.

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He had written to her many times;_____  , she didn't give any reply. _____, they had been out of touch ever since.

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It was midnight,____ they closed the restaurant and went home.

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It is very late now, _____ she is still at her office.

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Your son is heading to the trouble, _____I think you should encourage him to learn harder.

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The rice is only 6000 dong per kilo,_____we bought 10 kilos.

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He didn't attend the lesson, ______he could not do his homework.

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The boy was able to learn English, ______ he is very lazy.

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This is the shortest way to the city center,  ______ it is not the only way.

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The desert biome includes the hottest places in the world because it absorbs more ________ from the sun than land in humid climates do. 

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If the deserts are ________ managed, there may be troubles for scientific expeditions.

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I wanted to go a more ________ route across Montana.

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After Peter had returned from the Sahara desert, he was confined to bed by a ________ disease.  

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Can you make a ________ estimate of how much our expedition in the desert may be? 

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More and more ________ are very excited at discovering as many interesting things in the deserts as possible.

Choose the correct answer. Several deserts are a quite vast and uninhabited ________. 

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The hill was so ________ that it took us more than five hours to climb up.  

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San Francisco is built on 40 hills and some are very ________.