I think the environment is becoming worse.—Yes, I really don’t know we can do about it.

I don’t know ________ to deal with thisproblem.— Why not ask your teacher for help.

in music, according to the analysis of some traffic cases, is the main cause of many traffic accidents.

Unforgettable ______ her pale blue eyes that flashed like diamonds and thin lips wore a pleasant smile

Would you like to play basketball with us this afternoon— , but I have to study for tomorrow’s test.