15. Have you seen the lovely girl _____________?

A. that stands                                        B. who is standing over there

C. whom stands                                D. whom is standing

16. Mark and I have been penpals _____________ over two years.

A. in                        B. for                        C. since                D.by

17. I have bought a _____________ car.

A. black small French                                 B. small French black

C. French small black                                 D. small black French 

18. Pesticide, fertilizer and noise are all kinds of _____________.

A. pollute                B. polluting                C. pollutants                D. pollution