We must keep our room clean. Dirt and disease go , you know.
________Hard you may try, you can’t possibly persuade Tom to give up smoking, for he is so addicted to it.
Every year, Tom remembers to have some flowers ______to her mother on her birthday.
It’s not easy to learn English well. _______as much as possible is necessary.
-Peter, would you like a beer to go with your meal?—Sure, it___________.
Oct.1st, _________is our National Day, is always celebrated with singing and dancig.