Welcome to our idiom （习语） corner!

to feel very happy and excited （especially when sth．good has happened）

e．g．Jenny is walking on air because her friend invited her to the school dance．She can't wait to go．

an unknown person who enters a race and gets a good grade

e．g．Did you hear about the dark horse in the running race yesterday？It was his first race and he finished in the top ten．

to act quickly，without thinking

e．g．I hate working with Mary．She's quick on the trigger and always ready to get mad．

to encourage sb．to do sth．（especially sth．They shouldn't do）

e．g．When your classmate eggs you on to copy his test paper，you should say"no"to him．

54．Picture 　　can be chosen to express"to do something without thinking"．

55．We can't believe Robert won this watch．He's really 　　．

A．	a walking man
B．	a trigger
C．	a dark horse
D．	an egg

56．The Chinese meaning to the idiom"to walk on air"is probably" 　　"．

A．	一无所有
B．	欢天喜地
C．	愁眉苦脸
D．	不假思索

57．The writer didn't use 　　to help the readers understand the idioms above．

A．	explanations （解释）
B．	pictures
C．	examples
D．	results．