Question 22: Trilobites, a group of spineless animals, flourished in the oceans for several hundred million years                       some 200 million years ago.

A. that were extinct                                            B. and their extinction

C. became of their extinction                             D. until they became extinct

Question 21: After the fire, the government pledged to implement a program of           devastated national park.

A. reforestation             B. rebuilding                 C. replenishment          D. reconstruction

Question 20: It was                     that we went camping in the mountain last weekend.

A. such nice weather    B. so nice a weather      C. too nice weather       D. nice weather so

Question 19: I didn’t know                      my answer was right or wrong.

A. as if                          B. whether                    C. unless                       D. that

Question 18: I was doing my homework              the light went out.

A. after                          B. before                       C. while                        D. when

Question 17: Let’s begin our discussion now,             ?

A. shall we                    B. will we                     C. don’t we                   D. won’t we

Question 16: I will stand here and wait for you              you come back.

A. because                    B. thought                     C. so                             D. until

Question 15: It          me only five minutes to get to school

A. cost                           B. took                          C. brought                     D. spent

Question 14: The last person              the room must turn off the lights.

A. to leave                    B. who leave                 C. That leave                D. all are correct

Question 13: It is imperative that your face book password                       confidential.

A. need keeping            B. need to keep             C. needs to be kept       D. needed keeping