There is no doubt ________ those who work hard will succeed sooner or later.
#92568
A
if
B
whether
C
why
D
that
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It will be a long time           Mr Black            back from abroad.
#94801
A
before;comes
B
since;has come
C
before;will come
D
after;will come
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