You should remember that the harder you work, __________.

Talking loudly in a library is impolite.—In fact, we should also take care not to cough or sneeze loudly in public.

_____ has your father lived in the town? —Six years. [ ]

It is reported that China has created the first man-made sun in the world recently, ______ ?

We have T-shirts _____ green for only $ 8. [ ]