There are______ living things on the earth. We must value our home—the earth.
A. millions
B. million of
C. millions of

–Where is your father, Ted?
-He _______ Shanghai on business. He ________there many times.
A.has gone to, has gone to
B. has gone to, has been to
C. has been to, has been to

--- _______ will the fog and haze(雾霾) last?  ---I have no idea. There is no sign of an end.

---What a heavy haze! The air pollution is terrible now.
---It ________ worse unless we ________ action to protect the environment.

When I am        a bad mood, I like wearing orange to        .

It’s easy ________ you to say sorry, but remember __________ be late again.

— ______ do you like the song “trouble is friend”?
— Wonderful. It’s worth ________.

—I saw Ann        a green dress at the school meeting.
— I think she looks better        red.

People ______ drive after drinking wine or beer according to the new laws.

Some students found the life in college        boring.