23、These shoes look very good. I wonder ___.

A. how much cost they are                        B. how much do they cost

C. how much they cost                                    D. how much are they cost

21、Which do you prefer,          your weekends, playing computer games or watching TV?

A．spending          B．spend       C．being spent      D．to spend

20、The couple never had any friends,           anything to anybody.

A．or they ever gave                                        B．or have they ever given

C．nor did they ever give                                  D．nor they ever gave

19、Because of the limitation of space, I had to        a lot of excellent materials, which I intend to include in another book.

A．put away         B．leave out          C．cancel out        D．call over

18、While in London, we paid a visit to the hospital founded        Florence Nightingale.

A．in honor of                                                 B．in terms of          

C．in favor of                                                        D．in place of

17、It was a small country house but it was large           urban standards.

A．at             B．by            C．for           D．with

16、--- My girlfriend’s birthday is only a few days away.

--- Have you thought about          to send as a present?

A．how         B．when        C．which       D．what

15、The Kennedy brothers           each other a lot in appearance, so I can’t tell them apart.

A．compare   B．resemble   C．match       D．correspond

14、Once environmental damage         , it will take many years for the system to recover.

A．has done          B．is being done    C．is to be done    D．has been done