8.It ________ two weeks since she ________ down the stairs.

7.Closed due to illness, ________ on the office door.

6.By the middle of the twenty-first century, the robot ________ a necessity in every home.

5.By the time a baby ________ his first birthday, he should, without the help of an adult, ________ sit up or even stand up.

4.Alice's second-hand computer ________ wrong although she used it only once.

3.Hello, I ________ to telephone you all day. Where ________ ?

43.—Look! Somebody has broken a glass.

—Well, it ________ me. I ________ that.

41.—I ________ to be here on time.

—But you ________ late again.

40.—Hi, Bill, you are late.

—Sorry, I would have come sooner. I ________ that you were waiting.

39.Until then, his family ________ from him for six months.