The policeman came up to the house, whose door was open, _____ there for a while, and went in.
| A．to stand | B．standing | C．stood | D．stand |
Half an hour later, Lucy still couldn’t get a taxi _______ the bus had dropped her.
| A．until | B．when | C．although | D．where |
It was John who broke the window. Why are you talking to me as if Iit?
| A． | had done | B． | have done | C． | did | D． | am doing |
--- Is it true that Mike refused an offer from Yale University yesterday?
--- Yeah, but I have no idea _______ he did it; that’s one of his favorite universities.
| A．when | B．why | C．that | D．how |
Group activities will be organized after class _______ children develop team spirit.
| A．helping | B．having helped | C．helped | D．to help |
--- I spent two weeks in London last summer.
--- Then you must have visited the British Museum during your stay,you?
| A． | mustn't | B． | haven't | C． | didn't | D． | hadn't |