1 . Engineers ________(set) up over 15,000 sensors (传感器) nationwide and wiring them into a web. (所给词的适当形式填空)

2 . A new report found 46 percent of meals are eaten alone in America. More than half (53%) have breakfast alone and nearly half (46%) have lunch by themselves. Only at dinnertime __________ we eating together, 74%, according to statistics from the report. (用适当的词填空)

3 . They ______________(work) on the program for almost one week before I joined them，and now we ____________(work) on it as no good results have come out so far. (所给词的适当形式填空)

5 . It’s ten o'clock. My mother ________ (lie) in bed.   (所给词的适当形式填空)

6 . The prices of houses ________(rise) because the demand for houses is becoming greater and greater. (所给词的适当形式填空）

7 . Don’t delay! Tack ________ (wait) for you anxiously at the moment.(所给词的适当形式填空）

8 . Rain forests ______ (cut) at such a speed that they will disappear from this planet in the foreseeable future. (所给词的适当形式填空)

9 . Because the shop________, all the T-shirts are sold at half price. (close down) （所给词的适当形式填空）

10 . The camera you ________ (use) now ________ (belong) to me. （所给词的适当形式填空）