Question 6: Elephants                          the ecosystems they live in, and make it possible for a lot of other species to survive in those environments as well.

A. obtain                      B. remain                             C. maintain                  D.

Question 5: Susie and Fran                           us last night, so I had to quickly defrost a pizza.

A. turned up                 B. dropped in on                C. came across              D. went through

Question 4: I think  you  need to                   your  ideas  more clearly so  that the reader doesn’t  get confused.

A. dawn on                     B. set out                   C. get on with              D. give in

Question 3: I                      come.dinner. Just as it was ready, Chris and Jane phoned to say that they couldn’t

A. needn’t cook                                             B. didn’t need to cook

C. needn’t have cooked                                 D. didn’t need cooking

Question 2: For people to be able to survive in groups, individuals had to cooperate with each other, rather than                                   .

A. act alone               B. alone act                         C. act lonely              D. lonely act

Question  1:  The  production  of  different  kinds  of  artificial  materials                   conservation of our natural resources.

A. is                      B. have been                          C. are                         D. were

Question 90: The report says that over five years up to 2013, the                      almost a quarter of the US as land was converted to grow corn for ethanol.

A. crowd                  B. diverse             C. amount            D. abundance

Question 89: Generic medications are just as                  , and much less expensive.

A. effective as brand-name products           B. brand-name products effective

C. brand-name products as effective           D. effectively brand-name products

Question  88:  With  only  two  days  of                        negotiating  time  left,  hope  of progress  was  quickly evaporating at the climate talks.         A. official        B. office          C. officially     D. officious

Question 87: Researchers have discovered 2,000 types of new plants but also say                                are at risk.                            

A. many          B. much          C. the other     D. variety