As we all know the H1N1 Flu is so serious, students can’t go into the school _______ they take the temperature and get sure they don’t have a fever.

We couldn’t wait _______ a good rest afterthe exam.

ple eat natural plant poisons by mistake, they_______ go to hospital without delay.

You had better________ wine because you have to drive back home.

Mr. Wang, to experience different cultures, set off for Africa last week.