Man-made wonders are ____ than natural ones.
--- Do you know ________ girl over there?--- Yes. She is ________ exchange student from America.
The teacher said that they ______ hard-working students.
---Do you like talking with your friends on the telephone or on the QQ?--- _______. I enjoy chatting face to face.
The teacher encourages her students _____ English as much as possible.
I will stay at home and read books if it _______ tomorrow.