-- Is it necessary that he ____ to London but to New York?-- I think so, but the problem is ____ he has refused to.
—Hi, Tom. AnyideawhereJaneis? —She_____intheclassroom. Isawhertherejustnow.
---How do often you go to school? ---On foot_______it rains.
---I’m thinking of the test tomorrow. I’m afraid I can’t pass this time. ---______! I’m sure you’ll make it.
— I’d rather have some wine, if you don’t mind. —. Don’t forget you must drive.
The world’s elderly population will exceed(超过) ____ of children by 2060, when each group ____ to account for about one fifth of the population.