The solution ______ this problem is acceptable. So I am ______ it.

—Jessica is very bright and studies very hard _____.
—No wonder she always gets the first place in the examination.

The two top students in Mr. Green’s class competed _____ each other for the highest marks.

The school is _____ a Chinese teacher for the new term who masters the English language perfectly.

He is always helping people without expecting anything _____.

The conference was held to discuss the effect that tourism has ________ the wildlife in the area.

I hope that my father will quit smoking because I want him to live   my grandpa does.

Have you considered how weak humans are   a volcano, hurricane or earthquake?

When the meeting was ______, it was already midnight.

What a wonder! They have finished _______  half of the project in such a short time.