单项选择并解释
1.We mustn't be nervous when we are in danger.We should ____ cool.
A.take B.stay C.live D.make
2.You will ____ a lot of time if you go there by bike at this time of day.
A.store B.press C.save D.prepare
3.Unluckily,the dog bit the poor boy ____ his left hand.
A.in B.on C.to D.at