用括号内所给动词的适当形式填空。

1. ___________ your grandmother __________ (be) to the Museum of Flight before?

2. I _____________ (study) English at this school for three years.

3. Yao Ming _____________ (go) to America three months ago.

4. I need ______________ (improve) my spoken English.

5. Do you have any problem __________ (get) to the top of the hill?

6. The children started ____________(watch) the film at 2 o'clock and it hasn't finished yet.

7. It's fun _________ (learn) another language.

8. Next month Harry ___________ (visit) his grandparents with his parents.