Scientists say it may be five or six years ____ it is possible to test this medicine on human patients.
#92433
A
since
B
after
C
before
D
when
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I don’t remember how many years ago ______________I paid my last visit to the principle of my primary school.
#93595
A
it was that
B
was it that
C
it was when
D
was it when
________ 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
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