We work together to achieve our common purpose: ________ world that is safer, cleaner and healthier than ________ one we are living in.

Han Han is one of writers,though some old writers don’t like him very much.

Curiosity ______ Linda inside the slimming restaurant. [ ]

I used ____ papers and watch TV after dinner. But now I’m ________ a walk.

I don’t know________ they have passed the exam.