At home, he keeps some pets，to which he ________ all his spare time.

“ Isn’t that Tom playing basketball” “ It______ be; he fell off the ladder yesterday and got badly hurt”

People just wonder ________ that makes the housingprice so high.

give you a lift to the airport _______ you don’t mind the crowdedness, for there have already been four of us in the car.

You’d better keep the secret to ______, Millie and Lily.—OK, Amy. You should keep it for ______,too