35．The man was observed　　　 into the manager’s office and help himself to everything valuable．

A．slip　　 B．slipping　　 C．to slip　　 D．slipped

34．How disappointed the students were when　　 that their English teacher would not came to their English evening!

A．informing　　 B．informed　 C．being informed　 D．to be informed

33．-Aren’t you fond of the pop singer’s songs?

-Not at all．He is screaming　　 singing．

A．rather than　　 B．more than　 C．other than　　 D．or rather

32．Hosting the 29^th Olympic Games is a good opportunity for China to show to the world　

We have achieved in recent years．

A．which　　 B．that　　 C．where　　 D．what

31．My father is always busy and he seldom comes back home before 7:30 pm，　　 many people may have had supper．

A．by which　　　 B．since which　　 C．whose time　　 D．on which

30．Air pollution is a big problem in large cities，　　　 in developing countries．

A．exactly　 B．absolutely　　 C．extremely　　 D．especially