It's dangerous to let the children who are _____ go swimming in the river. 
#94757
A
too young to
B
so young
C
not old enough to
D
so old
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-----Is this the first time you _____Chengdu ?-----No. But the first time I _____here, the city wasn’t so beautiful.
#92365
A
visited, came
B
visited, have come
C
have visited, have come
D
have visited, came
No matter how bright a talker you are, there are times when it’s better ______ silent.
#92583
A
remain
B
be remaining
C
to remain
D
having remained
________ that China has the largest population in the world.
#93227
A
It’s no question
B
There’s no question
C
It’s no doubt
D
There’s no doubt