1£®There is no doubt that China ________ (witness) great changes in the past 30 years.

2£®I was about ________ (go) to bed when I heard someone knocked at the door.

3£®It is strongly urged that strict measures ________ (take) to prevent drunken driving.

4£®It was once a time ________ I had no interest in study and wanted to drop out of school.

5£®His son abandons himself to ________ (play) computer games, which makes him more than a little annoyed.

6£®The music festival, watched by millions of people, is held ________ (annual) in our city.

7£®This morning, I heard our neighbors ________ (yell) at each other, so I had no choice but to get up.

8£®________ (dive) into the swimming pool, she felt so relaxed and forgot all her troubles.

9£®After the flooding, hundreds of people left their villages and ________ (flee) to safe places.

10£®When I saw him last time, he was in the ________ (deep) of despair about losing his parents.