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
_____earth scientists understand how and why earthquakes happen, forecasts are usually inaccurate.
A. As B. While C. Because D. If
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
I was so excited last night that it was a long time _____I got to sleep.
A. that B. since C. before D. when
He finally won the general election because many of his promises were quite popular _____ the voters.
A. for B. in C. to D. with
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
