Trees are good for human being. We can’t plant them__________ many.

It’s time that I ________ my hair cut. It’s the eighth time that I ________ to the barber’s shop.

The message we’d like to _______ is that consumers should spend their money sensibly while shopping online.

_impressed me most was the scenery ofChangbai Mountains. [ ]

Zhang Yining has trained continuously for six hours ______ she is tired out