13. Jack started to speed up and I had to run to _______ in order not to fall behind.

A. hold on  B. keep up   C. get along      D. make up

12. Jessica was a newcomer to our class, but,   _   we didn’t know her, she was warmly received.

A. as       B. since     C. although     D. for

11. Researchers are trying to find out, if possible, _____ the pollution of the water in that area.

A. what is it that causes         B. what it is that causes

C. it is what that causes         D. it is that what causes

10. Every day, after the kids _______ to bed at 9 o’clock, I had to clean the kitchen.

A. are sent    B. will be sent  C. were sent  D. have been sent

9. _______ hasn’t been decided whether we’ll go outing.

A. What      B. One       C. This     D. It

8. So convinced was John of his artistic talents _ _ he decided to become a professional artist.

A. which     B. that       C. as       D. and

7. ― Is it OK if I smoke here?

― Sorry, you _______. This is a non-smoking area.

A. can’t     B. couldn’t    C. needn’t   D. wouldn’t

6. The old man got up just before sunrise, as he often did, _______ along the beach and breathe the fresh air.

A. walked   B. walking    C. to walk   D. having walked

5. ― Didn’t you receive my postcard from England?

― Oh, sorry, I _______ to tell you. I liked it very much.

A. forget    B. have forgotten    C. forgot    D. had forgotten

4. The book has been considered as _______ must-read one for those who want to get _______ success.

A. the; a    B. a; a     C. a; /    D. the; /