If we _________ the earth, we must take action before it is too late. 
#101505
A
will save
B
are to save
C
are about to save
D
are saving
推荐题目
He______ and was made to repeat it. 
#104327
A
didn'tunderstand
B
didn'tbeunderstood
C
wasn'tunderstand
D
wasn'tunderstood
We all jumped with joy at the exciting news, After all, we ______forward to the chance for many years.
#101641
A
are looking
B
were looking
C
have been looking
D
had been looking
The pair of leather boots that I bought last weekend_______ comfortably.
#103429
A
wears
B
is worn
C
was worn
D
was wearing