The poor girl needs an operation. But it will ________ a lot of money.

Excuse me, Mum. When can we have dinner?—Not until it in half an hour.

After the new technique was introduced， the factory produced _______ tractors in

It is demanded that the letter ___by the end of this week , dad !—-I’ll do it immediately .

______ of the students in my class plan to go abroad for ______ study in the future.