We should set up some shelters ____

We should set up some shelters _____the homeless people.

#48569

help

helping

helped

to help

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We can make a fire ____    the room warm so that we can chat for a while.

#49753

to keep

keeping

keep

kept

It was difficult for the rich _____ a happy life.

#48476

to have

having

had

have

— It is so hot in the classroom. Would you mind ____ the windows?—OK. I’ll do it right now.

#49682

not closing

not opening

opening

closing

Do you enjoy __________ on the Internet?

#49165

surfing

surf

to surf

surfed

We use a pencil for_________.

#48852

write

writes

writing

to write

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