We’ll do what we can ________

We’ll do what we can _________ our environment.

#49518

protect　

to protect　

be protected　

be protecting

推荐题目

Half of the class       done most of the work. The rest       rather difficult.

#50810

has, is

have, are

have, is

has, are

Nowadays it’s very useful ______ a foreign language.

#48542

learn

learned

to learn

learns

I see him _____ basketball almost every day.

#51038

play

to play

playing

plays

Would you like ________ me how ________ after my bird?

#51130

tell; look

to tell; to look

to tell; look

tell; to look

— Thank you for ______ me _______ the housework. —My pleasure.

#49655

help; to do

help; with

helping; doing

helping; do

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