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During the class, Tom slipped out of the classroom ____the back door so as not to be found by the teacher.

A. across       B. in         C. by                 D. beside

He finally won the general election because many of his promises were quite popular _____ the voters.

A. for          B. in           C. to                   D. with

I was so excited last night that it was a long time _____I got to sleep.

A. that         B. since            C. before           D. when

Mr. Smith wanted to buy the house and he told me that ____the house cost，it would be worth it.

A. however      B. how much         C. whatever         D. what

_____earth scientists understand how and why earthquakes happen, forecasts are usually inaccurate.

A. As           B. While        C. Because      D. If

I have been keeping the portrait _____ I can see it every day, as it always reminds me of my childhood in Paris.

A. since        B. where        C. as           D. if

It is an interesting story and one can't put it down _____ one has finished reading it.

A. after            B. when             C. since            D. until

I had just started back for the house to change my clothes _____I heard my name called.

A. as           B. for              C. while            D. when

After living in New York for 30 years, he returned to his hometown ______he was brought up by his uncle.

A. which            B. where            C. that         D. when

 Rescuers are still searching for the other 19 missing miners, _______survival chances are small.

A. who          B. which            C. whom         D. whose