— I can’t stand swimming in cold rivers in winter.
— But it’s ______ for your health. You know I often swim in rivers in different seasons.
A.painful B.harmful C.helpful D.careful
This kind of food should be______ cool, clean and dry according to the instruction.
A.carried B.kept C.placed D.put
The mark of PE will be increased to 60 points in Maanshan in order to ______ students’ physical quality（身体素质）.
A.produce B.make C.achieve D.improve
If there are any letters for me, ______ you send them on to this address?
A.must B.need C.can D.should
Thanks to our teachers. _____________ their help, we couldn’t make such great progress.
A.For B.Without C.With D.About
Dear Rita, long time no see! Do you know ______ I want to see you again?
A.how long B.how much C.how many D.how often
