(   ) 3. I always forget some new words. I'm very upset and don't know___________ 

A. how to do    B. when to do

C. what to do    D. where to do

(   ) 2. ―Excuse me,sir,smoking       in the gas station.

 ―Oh,I'm really sorry. 

A. doesn't allow B. don't allow C. isn't allowed D. aren't allowed

(   ) 1. Chinese      by more and more people from all over the world today.

A. learn    B. learned

C. is learned    D. was learned

6. He raised his voice to make himself _______  (hear) clearly.

5. We had a discussion on how       (get) there quickly.

4. Don't be afraid. The dog        (tie) to the tree.

3. A lot of trees      (plant) around here every year,and we can enjoy fresher air now.

2. ―Where       she        ( go ) tomorrow? ―I don't know.

1. We          ( leave ) for London next Sunday.

5. No matter when you need help,call me please.

      you need help, call me please.