Please don’t make any noise. —_________. I’ll be as quiet as a mouse.

Only after talking to two students ________ that having strong motivation is one of the biggest factors in reaching goals.

Organic food is produced from crops _____ chemicals, pests and so on. In one word, it is free frompollution of any kind.[ ]

I’m sure most of us will volunteer our time ______ other people.

Everyone must ___ their notebooks on the desk while taking an English exam.