If _____ to look after luggage for someone else, inform the police at once.
| A．asked | B．to ask | C．asking | D．having asked |
_____ the fact that his initial(开始的)experiments had failed, Pro. White persisted (坚持) in his research.
| A．Because of | B．As to | C．In spite of | D．In views of |
. -------Do you have enough to ________ the cost of your board at school?
-------Oh yes, enough and to spare.
| A．cover | B．spend | C．fill | D．spare |
When I talked with my grandma on the phone, she sounded weak, but by the time we ___ up, her voice had been full of life.
| A．were hanging | B．had hung | C．hung | D．would hang |
. Gun control is a subject Americans have argued for a long time .
| A．of which | B．with which | C．about which | D．into which |
It is generally said that man’s desire is hard _______.
| A．to satisfy | B．to be satisfied | C．to met | D．to being satisfied |