1. _______________________(禁止吸烟) in many public places.(forbid)
2. This is the first time that my teacher ______________________(批评我) in public. (criticize)
3. The gas _______________(一定用光了), for the fire went out of itself.(use)
4. At present e-mail, as well as telephones, ______________(正发挥重大作用) in daily communication. (play)
5. I try to understand ________________(是什么) that prevents so many Chinese from being as happy as one might expect. (it)
