. Leo ______ have kept his promise. I wonder why he changed.
| A．must | B．should | C．need | D．would |
7．Peter was so excited he received an invitation from his friend to visit Chongqing.
| A．where | B．that | C．why | D．when |
8．----I’ve got to go now.
---Must you? I you could stay for dinner with us.
| A．think | B．thought | C．have thought | D．am thinking |
The main cause of HIV / AIDS infection in China is drug abuse, ______ is very serious in Yunnan.
| A．what | B．who | C．that | D．which |
9.With the world changing fast, we have something new with all by ourselves every day.
| A．deal | B．dealt | C．to deal | D．dealing |
10. Professor Williams keeps telling his students that the future to the well-educated.
| A．belongs | B．is belonged | C．is belonging | D．will be belonged |