______ you are middle school students, you should learn to how to look after yourselves.

Please help yourself to some fish.It_________delicious.

(江苏省南通市2009期末调研)Rome was not built in a day. You should set ___________ goals and work hard to achieve them.

You should make it a rule to leave things _______ you can find them again.

The number of Chinese speakers in the world _________ with the development of China.