After saying good-bye, the couple moved off and __________ in the crowd.
Having ________ every night is very important for your health.
He made three good friends in the university, ______ joined the army after graduation.
_______ is certain, people’s living conditions in China have improved a lot since the 1980s.
Humans are polluting the earth day by day, ________, of course, will cause punishment sooner or later.
You’d better cut your hair short. Our school doesn’t _______long hair.