28.At the conference, the Chairman demanded that people present ________ every effort to protect the polar bear against dying out.

A.made B.would make

C.to make D.make

解析：选D。会上主席要求参加会议的人都要努力保护北极熊，以免灭绝。demand“要求”，后接that从句时，从句用虚拟语气，即“(should+)动词原形”。

29.—Shall we go out for dinner tonight?

—________.

A.You are right B.It must be funny

C.That sounds great D.Have a nice time

解析：选C。You are right你是对的;It must be funny那肯定很有趣;That sounds great好极了;Have a nice time祝玩得高兴。句意：——今晚我们出去吃饭好吗?——好极了。故选C。

30.You throw away food for some reason. ________， children are suffering from starvation all over the world.

A.Meanwhile B.Besides

C.Therefore D.Otherwise

解析：选A。你由于某种原因把食物扔掉了。而与此同时，世界上还有儿童在挨饿。meanwhile“与此同时”，用于强调两种情况之间的差异，符合题意。besides“而且”;therefore“因此;所以”;otherwise“否则;要不然”。

31.—What do you think of David?

—Very good. He always keeps his promise. You can quite ________ him.

A.take up B.depend on

C.get along D.watch out

解析：选B。“你觉得大卫怎么样?”“很好。他总是遵守自己的诺言。你完全可以信赖他。”depend on“依靠;依赖”，符合题意。take up“占据;从事”;get along“与……相处;进展”;watch out“当心;小心”。

32.—Have you ________ your proposal to the conference?

—Yes. It draws a lot of representatives’ attention.

A.admitted B.assessed

C.submitted D.handled

解析：选C。“你已向大会提交了你的提议吗?”“是的。它已经引起了很多代表的注意。”submit“提交;递交”，符合题意。admit“承认;允许进入”;assess“评估;评定”;handle处理;应付”。