Among the crises that face humans ________ the lack of natural resources.
#81014
A
is
B
are
C
is there
D
are there
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No sooner ______ home ______ I told him the exciting news.
#84496
A
had he got; when
B
had he got; than
C
he had got; when
D
he had got; than
Not until the woman was out of work again two months ago _______ going to attend a training class.
#80154
A
had she considered
B
did she consider
C
she considered
D
she had considered
Only when your identity has been checked ____________.
#82189
A
you are allowed in
B
you’ll be allowed in
C
will you allow in
D
will you be allowed in
While________ along the road, Mr. Smith met an old friend of his.
#80925
A
walked
B
he is walking
C
walking
D
is walking