My friend, who _____on the International Olympic committee all his life, is retiring next month. [ ]

There is no ______ swimming-pool in this school and the students often go to swim ______

How long do you think it will be______man can finally solve the problem of cancer?—Well，it depends

It was after careful consideration ________we decided to take action

I have booked my ticket back to Washington My flight leaves at 9:00 tomorrow morning—_______