Experts suggest eating foods that are rich in vitamins and nutrients _____ nutrient-packed calories could help to maintain the muscles we have.

A. however                   B. though                            C. because                    D. otherwise

After climbing for almost four hours, they were all tired out, but _____ of them would stop to take a rest.

A. any                          B. some                        C. none                        D. no one

The 48-storyed high-rise _____ fire last night, but fortunately the fire was soon under control with the efforts of both the firemen and residents.

A. was caught               B. was catching            C. caught                            D. had caught

Expose yourselves _____ an English radio broadcast, a tape recording, a film or a video to cultivate good habits of learning a foreign language.

A. in                                   B. to                                   C. on                           D. with

在過去的三十年里，中國人民以巨大的勇氣、信心和創(chuàng)造力取得了了不起的成就，這令整個世界震驚（…, which … ）

人們普遍認為學會合作有利于問題的解決。 (It … )  

夏天還沒到呢，孩子們就迫不及待地想游泳了。 （wait）

一旦你承諾要做某事， 就要守信用。 （once）

一個人年輕時多學點是有好處的。 (beneficial)

考試時一定要仔細。 （in）