单选题 Some sports are not really ______, and you can hurt yourself badly when you do them.

单选题 A good ______ will tell you what to do and how to win a race.

单选题 You can get your medicine from a ______.

单选题 Some teenagers ______ from home after a fight with their parents.

单选题 You've eaten too much, and that is why you have a ______ in your stomach.

单选题 Most people have a hobby that they ______.

单选题 It is not very healthy to jog alongside a motorway because of the ______.

单选题 Chen didn't want to play football in the afternoon; he just wanted to ______ with his friends and relax.