—It’s difficult to get to the other side of the river.—I think a bridge        over the river.
#44615
A
should be built
B
should build
C
will build
D
has built
推荐题目
---Mum,_______ I watch TV? ---No. Unless your homework _______________.
#44578
A
could; finishes
B
can; will finish
C
may; is finished
D
can; will be finished
Food safety is important. Rules _____ to stop people from food pollution.
#44569
A
must make
B
must be made
C
mustn’t make
D
mustn’t be made
Every year lots of trees ____________ to make our country more beautiful.
#44817
A
is planted
B
was planted
C
are planted
D
were planted
---Why is the classroom so dirty? --- Sorry, sir. It ______ yesterday. We forgot to do it. 
#44831
A
doesn’t clean
B
didn’t clean
C
isn’t cleaned
D
wasn’t cleaned