1 . Some scientists suggest ________ at an early age, but others do not.

A．write

B．to write

C．writing

D．to writing

2 . Try to avoid _________ that way. You might hurt other people.

A．speaking

B．to speak

C．speak

D．spoken

3 . My nephew practiced ________ the saxophone during the summer holidays.

A．play

B．played

C．playing

D．to play

4 . Susan finally became a popular singer after she practised ________ for years.

A．sing

B．singing

C．to sing

D．sang

5 . My brother spent two days ________ his bicycle and turned it into a new one again.

A．fix

B．to fix

C．fixing

D．fixed

6 . Dad, I prefer to go shopping with you instead of ________ at home alone. (leave)

7 . How about ________ to English radio programs every day if you want to improve your listening skills?

A．listen

B．to listen

C．listened

D．listening

8 . Parents often have difficulty ________ with their teenage children. (communicate)

9 . Now many elderly people practice sword ________ in the morning. (fight)

10 . Let me have the novel first after you finish ________ it.

A．write

B．to write

C．writing

D．wrote