Choose the best answer. 

This is an expensive ________ very useful book.

Choose the best answer. 

________ long it takes, I will wait for you. 

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

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

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

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

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

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

Choose the best answer. 

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

Choose the best answer. 

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

Choose the best answer. 

Everyone ________ Tom is ready for the discussion. 

Choose the best answer. 

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

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

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

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

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

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

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

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

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

: 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.

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

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

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.