Modal verbs

They ...swim very fast but they....dive.

His Math isn't good, he....study better.

I have got a toothache.You .....go to the dentist.

You ...buy the present yesterday.

The pupils....make noise in the classroom.

I....visit my granny on Saturday.

Pupils....come to school in time.

A woman....become President in Ukraine.

We....watch TV a lot.

People...smoke.

We.....play hockey in summer.

People....live on the Moon.