29. If city noises____from increasing, people___shout to be heard even at the dinner table 20 years from now.
#103910
A
are not kept; will have to
B
are not kept; have to
C
do not kept; will have to
D
do not kept; have to
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The parcel _____ so much that I dropped it on the stair.
#99829
A
weighs
B
is weighed
C
was weighed
D
weighed
We________on this project for four hours.Let's have a rest.
#99184
A
are working
B
have been working
C
worked
D
had worked
---Has your father returned from Africa yet? ---Yes, but he ____ here for only three days before his company sent him to Australia．
#103213
A
was
B
has been
C
will be
D
would be
Experiments of this kind in both the U．S．and Europe well before the Second World War．
#102432
A
have conducted
B
have been conducted
C
had conducted
D
had been conducted