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We’ll do what we can _________ our environment.
#49518
A
protect　
B
to protect　
C
be protected　
D
be protecting
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She tried ________ Chinese in English.
#51095
A
to not speak
B
not to speak
C
not speaking
D
didn’t to speak
—Shopping with me?—Sorry. I have a lot of clothes________.
#50971
A
to wash
B
washed
C
wash
D
washing
When did Jenny finish ______ the letter yesterday?
#49720
A
to write
B
wrote
C
writes
D
writing
Teachers’ job is ______ the students learn well.
#50176
A
helping
B
help
C
to help
D
helped
-------It’s time to have class. Please stop _________.   -----  OK.
#49528
A
to talk
B
talking
C
talk
D
talks