6) The countrytside air is fresh _________ it's not polluted.

A. however B. whenever C. moreover D. beside

7. _______________ she spoke slowly, I don't understand her.

A. Since B. Although C. IF D. As

8) We will wait her _____________ he comes back

A. while B. until C. since D. for

9) Our teacher explained the lesson slowly ____________ we might understand him.

A. and B. so that C. if not D. or

10. ________ it rained heavily, we went to school on time.

A. Even though B. Despite C. Because D. Though not

11) Our visit to Japan was delayed __________ my wife's illness.

 A. because B. because of C. thanks to D. although

12) ____ he goes to the theatre with me, I shall go alone.

A. because of B. because C. unless D. when

13) He tries his best to work hard ___________ help her family get over the difficulties.

A. so as that B. in order that C. in order to D. so as not to

14) We moved to the front row ____________ we could hear and see better.

A. so as that B. because C. although D. so that

15) I made a mistake __________ I was tired after the work.

A. though B. so that C. because D. if

16) Minh had a terrible headache. ____________ he still wanted to go to school.

A. Therefore B. But C. However D. Although

17) My sister will take the plane to Singapore __________ she dislikes flying

A. because B. so that C. therefore D. though

18) My car broke down on the way ___________, when I got the airport, the plane had taken off.

A. Because B. However C. Therefore D. Although

19) His mother was sick.__________, Jane had to stay at home to look after her.

A. But B. However C. So D. Therefore

20) They asked me to wait for them; __________ he didn't turn back.

A. but B. however C. so D. therefore

21) Many people still believe him very much ___________ he sometimes tell lies.

A. because B. since C. although D. despite

22) They were walking on the street _________ there was an accident.

A. when B. while C. because D. so that

23) _____________ the darkness in the room, we couldn't continue our studying.

A. because of B. since C. although D. in spite of

24) Mary tries to study as hard as possible ___________ she can get the scholaship to study in England.

A. in order to B. so that C. because D. because of

25) She stopped at the post office ____________ she could send the letter to her parents.

A. although B. so as to C. in order that D. despite

26) He didn't wear warm clothes _________ the cold weather in winter.

A. because B. although C. because of D. in spite of

27) What had you done ____________ Iphoned you?

A. as soon as B. by the time C. after D. while

28) Tom couldn't get a job ____________ he couldn't speak English well.

A. because B. although C. because of D. in spite of

29)_____________ he knew the danger of smoking, he couldn't give it up.

A. Since B. Though C. Because of D. Despite

30) He knew the danger of smoking___________he couldn't give it up.

A. therefore B. but C. however D. although

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