入空白处的最佳选项。
1．christmas is ________ special holiday when ________ whole family are supposed to get together．
a．the ; the b．a; a c．the; a d．a; the
2．one of the best ways for people to keep fit is to ________ healthy eating habits．
a．grow b．develop c．increase d．raise
3．busy _______ she is, rita ______ two hours every sunday afternoon to spend with her son．
a．though, sets out b．as, sets aside
c．as, sets down d．though, sets off
4．as we all know, it takes ten years to grow trees but a hundred to rear（培育） people, which means it will be ________ one becomes a useful person．
a．before long b．long after c．after long d．long before
5．– how cold it is! i wonder how grass survive under such heavy snow．
--don’t worry．there is a lot of air in loose snow which _______．
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