20、She will tell us why she feels so strongly that each of us has a role _______ in making the earth a better place to live on．

A．to have played                            B．to play

C．to be played                            D．to be playing

19、Alice asked Mary _______ she could tell her the general idea of the poem．

A．that if             B．whether          C．that          D．how

18、The teacher told us that light _______ faster than sound．

A．traveled                                    B．had traveled

C．is traveling                                D．travels

17、---How are you getting along with your pen-friend？

---Over the years we've grown very ______of each other．

A．fond           B．grateful             C．giant          D．equal

16、The school has a system of_______ and punishments to encourage good behaviour．

A．attitudes           B．traps         C．rewards          D．commands

15、---Have you had many visitors yet?

---No, ________you're the first．

A．as usual                                                        B．as if

C．as a matter of fact                                                                                         D．as a whole

14、With the money earned from the school garden, the students bought a blackboard, chairs and other things to________a “green classroom”．

A．pack up        B．set up         C．add up          D．come up

13、You will be successful in the interview ______ you have confidence．

A．before         B．until          C．once         D．though

12、The financial crisis today is much more serous in comparison to____ we faced many years ago．

A．that ; which         B．which ; what        C．what ; which               D．which ; that

11、He has been watching TV all day. He _______his essay．

A．shouldn’t have finished                          B．mustn’t have finished

C．needn’t have finished                            D．couldn’t have finished