My father has gone to the countryside. He’ll be back_____ three days.[ ]

The boy has _____ poor eyesight, but he has _____ good sense of humour.

What are you going to buy _______the money? —A big house. [ ]

Modern science has given ____clear evidence ____ smoking can lead to many diseases ____ it’s time for us to take measures.

Two students in our school will go to the beach.