What can we students do ____

What can we students do _____ the environment?

#50177

to protect

protected

protecting

protects

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Would you mind __ me how ___ the chemistry problem?

#48735

telling；to solve

telling；solve

to tell；to solve

to tell；solve

I’d like_____to Beijing.

#48850

traveling

travel

travelling

to travel

The boring film on TV make me       to sleep.

#49607

wants

to want

want

wanting

I’d like a piece of paper____.

#50592

to write

to be writing

to write on

to write with

Let’s ____the books.

#49729

to go and find

to go and to find

go and find

go and to find

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