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.
