Air pollution, together with littering, ____ many problems in our large industrial cities today.
#96011
A
causes
B
cause
C
caused
D
causing
推荐题目
____ the TV play, he got down to ____ his homework.
#96801
A
Watching; do
B
After his watching; do
C
Watched; doing
D
Having watched; doing
The traditional approach ____ with complex problems is to break them down into smaller, more easily managed problems.
#96069
A
to dealing
B
in dealing
C
dealing
D
to deal
My parents are ________ to live in the countryside,where the air is clean and the vegetables are fresh．
#96663
A
proper
B
satisfying
C
content
D
disappointed
The teacher was absorbed in writing something, only _____ now and then to refer to a book or another.
#95364
A
to stop
B
stopped
C
stopping
D
having stopped
The boy wanted to ride his bicycle in the street, but his mother told him___________ .
#94476
A
not to
B
not to do
C
not do it
D
do not to