Exercise 3: Circle the letter A, B, C or D that indicates the best answers.
1.__________ he always did well on his English tests, his parents were not surprised that he got
an B level.
A. When         B. Since      C. Because of      D. Although
2. He doesn't understand __________ he doesn't speak French very well.
A. whenever        B. so that      C. because      D. before
3. She is looking for a new job__________ she is tired of doing a routine job day after day.
A. since       B. as      C. because     D. all are correct
4. I haven't seen Tom__________ he gave me this book.
A. since       B. for     C. until     D . before
5. __________ he has a headache, he has to take an aspirin.
A. How         B. Because       C. Where        D. Although
6. Our visit to Japan was delayed__________ my wife's illness.
A. because       B. because of           C. thanks to        D. though
7. The flight had to be delayed__________ the bad weather.
A. because        B. due to       C. because of          D. B and C are correct
8. I couldn't unlock it__________ I had the wrong key.
A. because         B. so that        C. since      D. so
9. He hasn't written to us__________ he left.
A. as long as          B. since        C. by the time        D. as soon as
10. I made a mistake__________ I was tired.
A. though            B. so that       C. because      D. if
11. You need good shoes to go hiking in the mountains_______ the ground is rough and hard.
A. because         B. so that      C. before      D. even though
12. __________ he is tired, he can't work longer.
A. Because        B. Even though        C. Although        D. Besides
13. __________ he wasn't ready in time, we went without him.
A. When           B. Moreover         C. As         D. So
14. Is that all__________ would you like something else?
A. because        B. since            C. as         D. or
15. You will have to pay higher insurance__________ you buy a sports car.
A. if            B. although         C. so that         D. before
16. I haven’t been climbing__________ I broke my leg last summer.
A. although            B. since           C. so that          D. before
17. He went to bed __________he was sleepy.
A. because           B. so that          C. because of           D. although
18. ___________ the storm warnings, we didn’t go out last night.
A. Because           B. Because of           C. Although          D. In spite of
19. You may get malaria__________ you are bitten by a mosquito.
A. if              B. so that           C. though            D. before
20. It was difficult to deliver the letter____________ the sender had written the wrong address
on the envelop.
A. because          B. despite           C. though          D. because of