Choose the best anwser

1.  Polluted water can directly do harm                      people’s health.

a.  for                            b. on                            c. to                             d. over

2.  There have been      many changes around here                      I was a boy.

a.  during                      b. since                        c. while                        d. when

3.  Unless we water some day. our water resources, there will be                      a shortage of clean

a.  waste                       b. use                           c. conserve                  d. replace

4.  The man                      wrote this book had a fascinating life.

a.  who                         b. which                      c. whose                      d. whom

5.  I have been working hard on mv English                      it is not any better.

a.  but                           b. so                             c. or                             d. and

6.  John drives                      than Peter does.

a.  much carefully        b. as carefully              c. more carefully         d. more careful

7.  Jane together with her friends                      our trip.

a.  are joined                b. were joining            c. have joined              d. is going to join

8.  you help                      me, I won’t be able to finish my work on time.

a.  If                             b. Unless                     c. Since                        d. Although

9.  Peter suggested                      everything again.

a.  us to check              b. we will check          c. us check                   d. we should check