22、The other day, my brother drove his car down the street at _____ I thought was a dangerous speed．

A．as          B．which           C．what         D．that

20、A survey of the opinions of experts ____ that drinking a glass of hot milk before going to bed helps one sleep well．

A．shows         B．show          C．is showing           D．have shown

19、Xiamen Xiang'an Tunnel, _____ is the first undersea tunnel built in mainland China, opened to traffic on April 26th．

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

18、It rained for several weeks, completely ____ our holiday．

A．ruined              B．ruining              C．to ruin           D．ruin

17、—How long have you been here?

—___ the end of last year．

A．Since               B．At            C．By               D．In

16、It is every citizen's duty to _____ our country when she is attacked by the enemy．

A．approach           B．defend         C．support           D．preserve

15、China Daily is _____ a newspaper; it keeps us in touch with the world．

A．no more than        B．not more than        C．more than      D．less than

14、Because of the powerful earthquake, telephone lines, electricity and water supplies were

____ in that area for several days．

A．cut down           B．cut in         C．cut up            D．cut off

13、I don't have enough money．I, _____, can't afford to buy Audi A3 Sportback．

A．therefore            B．so        C．however               D．thus