My pen pal Ann found it difficult _____

My pen pal Ann found it difficult ______ Chinese well.

#48777

learning

learn

to learn

learned

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Everyone should do something ______ wild animals.

#49313

to protect

protecting

protect

to protecting

—May I listen to the music here, Mr. White?—Sorry, you’d better         it like that.

#50541

not to do

not do

don’t do

not do to

You must be tired now. Why not ____ a rest?

#51081

to stop to have

to stop having

stop to have

stop having

There are some children _____ in the room.

#50736

singing

sing

are singing

to sing

It’s really kind ____ you to help me ____  my English.

#51002

for, with

to do

of, with

of, at

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