19、I _________ have written to him because he would come back as he informed us.

A. couldn't          B. ought to            C. must                D. needn't

18、Try recording your voice in English--this may help you to see__________ you could improve.

A. that              B. when               C. how                 D. where

17、—Why haven't you asked Lily to come here'?

—She was doing a project when I found her and she _____________it.

A. hasn't finished   B. didn't finish           C. wouldn't finish     D. hadn't finished

16、____________ ways to be more gentle with the earth, or we'll be punished for what we've done.

A. To find          B. Finding             C. Found               D. Find

15、_______ they advance through the program, they will learn how to read short sentences with 100% accuracy.

A. As               B. While             C. Though              D. Before

14、Watching me playing various tricks to stop the baby crying, the mother fought hard to _________her laughter.

A. hold back        B. take off             C. carry on             D. turn down

13、Professor Wooden makes roughly $1,000 every week, and 60 percent of ____________is spent on books.

A. which            B. them               C. it                   D. what.

12、The traffic problems we are looking forward to seeing _____ should have attracted the government's attention.

A. solving           B. solve               C. to solve             D. solved

11、—Is William seriously ill?

—_________.He was rushed to hospital last night.

A. I'm afraid so     B. I'm afraid not      C. I hope so            D. I guess not

10、China's population is expected to increase to about 1.5 billion in 2040, ________it will start to decline slowly.

A. where            B. after which         C. on which            D. which