—Charlie has been nowhere       for three days. What has happened to him?
—Didn’t you know he had gone to Hong Kong?

He goes to work every day ______.

The tiger, once a ____ animal to humans, is now ____of disappearing on the earth.

Washington, a state in the United States, was named _____ one of the greatest American presidents.

Scientists are convinced _____ the positive effect of laughter _____ physical and mental health.

You can’t imagine this lake used to be a beautiful place in our province       .

He slipped and broke his leg. _________, he will have to be away from school for two or three months.

They gave a banquet(宴会) _________ the guests from Britain.

A heavy learning burden leads to unhealthy behaviors such as poor eating habits, which ___ damage the health of students.

According to the arrangement, the speaker first talked about sports _____ and then about football in particular.