We can see clearly from the top of the building_____________ that the police are talking to．

     A．what is it            B．who it is

     C．how is it            D．where it is

Children under 16 are not permitted to see such kind of films_____________ is bad for their mental development．

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

The properties of the metal are_____________ if we are to use the metal in engineering．

     A．studied               B．studying

     C．to study             D．to be studied

一I just saw Roger at the bus stop．Why_______ he________ for a bus?

一He has to go to the university for the 10 o’clock class．

    A．is；waiting         B．does；wait

    C．did；wait           D．will；wait

When we arrived in the middle of the night，there was no food_____________ as all the shops were shut．

     A．1eft                   B．available                  C．remaining                 D．convenient

Do you expect_______ to be a possibility that more and more students from poor families will be able to go to college?

    A．this                    B．that                         C．it                            D．which

In my opinion，shoes made in China are mostly of high quality and__________ long．

    A．are worn             B．wears

    C．are wearing         D．wear

By doing the program with another person，Mr．Green and his partner received a 10％discount for the course，_____them more than l,000 yuan．

A．saving                     B．to save                     C．saved                        D．save

I went to the company to rent a bus which can______________50 people for our trip to Luoyang．

    A．1oad                  B．hold                        C．fill                          D．support

Science experts think the success of the G20 mostly depends on_______ China and the US decide upon．

    A．one                    B．what                       C．those                       D．how