. Listen! Do you hear someone __________for help?
Environment protection requires our joint effort. ______ will be achieved unless we work well together.
---Can I join your club, dad? ---You can when you _______ a bit older.
Because the shop_______, all the T-shirts are sold at half price.
---Jack hurt his leg yesterday. ---Really?________?
---I love the Internet. I’ve come to know many friends on the Net. ---_______ .Few of them would become your real friends.