L4 REVIEW File 7

I need ___ some emails.

• to answer

• answer

• answering

• to answering

The situation is difficult ___.

• for explain

• explain

• to explain

• explaining

I don't know what ___.

• to do

• do

• that I do

• doing

I don't really mind ___ housework.

• to do

• doing

• do

• to doing

___ is the best form of exercise.

• To swim

• Swim

• Swimming

• Swam

___ bring our books tomorrow?

• Do we have to

• Do we must

• Have we to

• Are we have to

It's free. You ___ pay.

• don't have to

• must not

• haven't to

• doesn't have to

You must ___ your grandfather.

• to call

• call

• calling

• to calling

I ___ to pay you back next week.

• buy

• mind

• try

• promise

Don't ___ to turn off the light before you go.

• hate

• learn

• stop

• forget