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

在过去的三十年里，中国人民以巨大的勇气、信心和创造力取得了了不起的成就，这令整个世界震惊（…, which … ）

人们普遍认为学会合作有利于问题的解决。 (It … )  

夏天还没到呢，孩子们就迫不及待地想游泳了。 （wait）

一旦你承诺要做某事， 就要守信用。 （once）

一个人年轻时多学点是有好处的。 (beneficial)

考试时一定要仔细。 （in）