30、He speaks English well indeed, but of course not _____ a native speaker.

A. as fluent as    B. more fluent than   C. so fluently as      D. much fluently than

29、The flu is believed _______ by viruses that like to reproduce in the cells inside the human nose and throat.

A. causing       B. being caused         C. to be caused        D. be have caused

28、The flowers ____ sweet in the botanic garden attract the visitors to the beauty of nature.

A. to smell             B. smelling         C. smelt           D. to be smelt

27、The disc, digitally ______ in the studio, sounded fantastic at the party that night.

A. recorded       B. recording   C. to be recorded      D. having recorded

26、American women usually identify their best friend as someone _____ they can talk frequently.

A. who        B. as     C. about which      D. with whom

25、After Yang Li wei succeeded in circling the carth, _______ our astronauts desire to do is walk in space.

A. where               B. what           C. that             D. how

24、Jasmine was holidaying with her family in a wildlife park _____ she was bitten on the leg by al lion.

A. when         B. while          C. since          D. once

21、The doctor advised Vera strongly that she should take a holiday, but _______ didn’t help.

A．it     B．she    C．which       D．he