用所给词适当形式填空。   
1. Tom and Mary ___________ (come) to China next week.
2. Mike _________________ (like) playing basketball.
3. Mary can __________ (read) English book at home.
4. When _________ (be) their birthday?
5. Why___________ (do) Mike like summer?
6. Which season ___________ (do) you like?

This ________ my grandmother. （   ）

A．is

B．am

C．are

—When did you learn to walk? （  ）
—When I _____ 2 years old.

A．be

B．was

C．am

D．were

—How much  the apples? (   )
—Two yuan.

A．is

B．are

C．do

用所给词的正确形式填空。
1. We can use solar panels to__________(change)sunlight into electricity.
2. It __________（be）motion energy.
3. They come from the remains of dead __________ (plants) and __________ (animals).