1 . —         I use your computer, Dad?                    
—Yes, you can.

A．Must

B．Could

C．Would

D．Should

2 .

2 . Grandma will be sad if she knows the news, so let’s keep it a s________（秘密）from her.

3 . She is looking after her s________ mother. Her mother is ill in hospital.

4 . We can plant more trees around the city because it’s important _____（protect）the Earth.

5 . My favorite subject is __________________ (生物). We can learn a lot from it.

6 . Davis can discover many insects.    (改为同义句)
Davis has the ________ __________ discover many insects.

7 . It is important for us __________ (develop) a good habit of eating healthy food.

8 . I can name ________ (不同的) school clubs.

9 . I always have great ________ (快乐) with my friends.

10 . Mothers send their kids to all kinds of classes. And they often c_________ their kids with other children.