____________ 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

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

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

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

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

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

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

—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

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

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

About one third of the population in Beijing and Shanghai_________ netizens, but in poorer areas, only three or four percent _________online.

A. is; is             B. are; are            C. are; is              D. is; are

Come to me early tomorrow morning. If I _________, wake me up.

A. sleep    B. will be sleeping    C. was still sleeping   D. am still sleeping