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

A．write

B．to write

C．writing

D．to writing

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

A．sing

B．singing

C．to sing

D．sang

3 . We don’t have to waste our time ________ food in the kitchen all day long.

A．prepare

B．to prepare

C．preparing

D．to preparing

4 . They prefer________ hiking, but I don’t really feel like it. Maybe I’ll stay at home instead.

A．go

B．to go

C．going

D．going to

5 . What about ________ a picnic in the park?

A．have

B．to have

C．having

D．has

6 . Ancient people spent plenty of time ________ animals for food. （hunter）

7 . Jenny denied ________ anything about the missing purse yesterday afternoon.

A．know

B．to know

C．knowing

D．knew

8 . I remember ________ him 200 yuan last week, but he forgets ________ the money to me.

A．lending, to return

B．to lend, to return

C．lending, returning

D．to lend, returning

9 . I’m really looking forward ________ with you on the project.

A．work

B．to work

C．working

D．to working

10 . Follow the instructions seriously, and you can avoid ________ into trouble at work.

A．get

B．to get

C．getting

D．to getting