【推荐1】—I tried________ it out in this way, but I failed (失败).
—Why not________ it in some other ways?

A．to work; try doing

B．to work; try to do

C．working; to try to do

【推荐2】You don’t need ________ it right now if you are busy.

A．to finish

B．finish

C．finishing

D．finished

【推荐3】Dr. Bethune worked very hard without resting and managed ______ over a hundred lives.

A．save

B．saves

C．saved

D．to save

【推荐1】—Tell the children ________ unhealthy food. It’s bad for their health.
—OK, I will.

A．not to eat

B．not eating

C．not eat

【推荐2】—It is so hot today. Why not swim in the river?
—We can’t swim in the river. Our teachers and parents always warn us ________ in the river. It’s too dangerous.

A．to not swim

B．swimming

C．not to swim

D．not swimming

【推荐3】We promise _________ our city. We want to be friends of the Earth.

A．not to polluting

B．not to pollute

C．to not pollute

D．won’t pollute