With a lot of difficult problems _______, the manager felt worried all the time.

A. settled　　　　　　 B. to be settled 　 C. settling　　　　　　　　 D. to settle

Our bad living habits will destroy the earth. Only by changing _______ we live can we save the earth.

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

Charlie Chaplin is considered ________ a great contribution to the film industry.
A. to make                                                       B. making                                           C. to have made               D. having made

He works as an engineer now, but he _______ on a farm for three years.

A. has worked　　　　　　 B. worked　　　　　 C. was working　　　　 D. had worked

A war is so cruel that it always causes great losses, _____ has happened in Iraq and other countries.

A. what　　　　　　　　　　 B. it　　　　 C. as　　　　　　　　　　 D. one

— Sorry, I forgot to wake you up this morning.

—      

A. Go ahead.     B. Forget it.       C. Why not?          D. You’re welcome.

Life is like a long race ______ we compete with others to go beyond ourselves.

A. why　　　 B. what　　　　　　 C. that　　　　　　　 D. where

—So can I ask you a few fairly straightforward questions?

　 —No problem. I like ______ when people are open and direct.

A. that　　　　　　 B. this　　　　　　　　　　　　 C. it　　　　　　　　　　　　　　 D. them

________ he has been getting on well with his studies makes all of us happy.

A. Which　　　　　　 B. How　　　　　　　　 　　　 C. What　　　　 　　　　　　 D. That

Don’t worry too much about ______ mistakes. They are _____ natural part of learning.

A. the, a　　　　　　　　 B. 不填, a　　　　　　 C. the, 不填　　　　　　　　 D. the, the