Nowadays food safety is a big problem and nobody can guarantee all foods are safe to us, but food produced in the normal companies is ______ better.

 ----- How often do you go home? ----- _________.

—Must I turn off the gas after cooking?—Of course.You can never be ________ careful with that.

---- Do you think it's a good idea to make friends with your students? ---- _____ , I do．I think it's a great idea．

The committee is discussing the problem right now. It will_____ have been solved by the end of next week.