We must do everything we can waste water from running into rivers.
#48694
A
keep
B
kept
C
to keep
D
keeping
推荐题目
He always gives me useful advice when I don’t know next .
#48456
A
how to do
B
when to do
C
what to do
D
where to do
—Would you like camping with me? — I’d like to. But I’m busy my homework.
#48529
A
to go; to do
B
to go; doing
C
going; to do
D
going; going
–Do you have some trouble ____ the problem? Do you need some help?--No, thank you. I can make it myself.
#50320
A
solve
B
solving
C
to solve
D
solved
What difficulty I had _____ the dirty walls! I had no choice but to have it ____ again.
#48673
A
clean, paint
B
cleaning, painting
C
cleaned, to paint
D
cleaning, painted