-- Do you know everyone from Class One?-- Er…, I know some of ______.A. they B. them C. their
China is ____ the west of Japan and ____ the east of Asia.
—____ can come in. I’m too busy to see ____. —Ok, I know.
–I won the first prize in English Writing Competition. --_____________.
Turn the radio ______, please! The baby has just fallen asleep.
At the top of the high mountains, there is very _____ oxygen in the air.