exercise often而为什么不是often exercise?

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Do you want to keep 1 Exercise often,please.If you usually go to work by bus,from now on you'd better go to work by bike or 2 .If you always 3 late in the morning and only eat supper every day,I think you should have the clock wake you up 4 and do some morning exercises 5 .You can breathe (呼吸) the fresh air and have a 6 diet .Do you like to eat 7 ,for example,potato chips,hamburgers or hot dogs?Sure they're 8 .But I think you should eat more 9 and fruit instead of (代替) them.Too much junk food is not 10 for you.
1.A.clever B.tall C.healthy D.thin
2.A.by bus B.on foot C.by car D.by plane
3.A .exercise B.go to bed C.have breakfast D.get up
4.A .early B.late C .quickly D.quietly
5.A .inside B.outside C.at home D.in the bedroom
6.A .full B.balanced C .good D.bad
7.A .meat B.salad C.junk food D.potatoes
8.A .cheap B.well C .expensive D.delicious
9.A .vegetables B.noodles C .dumplings D.juice
10.A .bad B.good C .hungry D.worse