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What we have to admit is that never before ______ so greatly as today.

A. had Hefei changed   B. Hefei has changed  C. has Hefei changed  D. Hefei had changed

 An average of about 100 emails a week ______ received. Such ______the case with Martin at present.

A. are; are   B. is; is   C. is; are  D. are; is

 The last decade of the 21^st century ________the rapid, steady development of China in various fields.

A. witnessed   B. was witnessed   C. is witessed   D. had witnessed

Shen zhou VIII has docked with Tiangong-I successfully, ______ the start of the establishment of China’s own space station.

A. marked  B. to mark   C. marking   D. having marked

 Tsinghua University, founded in 1911, is a first class university, ______ lots of people are eager to study.

A. which  B. where   C. when   D. why

---We’ll go to the party to be held in Anhui Grand Theater at 8 tonight. Could you join us?

---I’m afraid I can’t. I ______ the paper with my instructor.

A. am discussing   B. have discussed   C. will be discussing  D. will have discussed

 Mrs. Brown always told her children to be good, warning them to ________ trouble.

A. live up to   B. keep out of  C. put up with  D. take part in

 The incomes of men workers went up by almost 50 percent,________, women workers saw their earnings fall.

A. Moreover  B. Meanwhile   C. Otherwise   D. Therefore

 Bob looked back only to find an old classmate whose name_______him for the moment.

A. escaped  B. missed   C. forgot   D. passed

 The European Union has been hit by the debt crisis one time after another, ________ resulting in great panic.

A. neither   B. either   C. none   D. each