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
----Did you watch the football final between China and Japan?---Yes, but I would rather____.
#104030
A
not do that
B
not doing that
C
not have done that
D
hadn’t done that
The pair of leather boots that I bought last weekend_______ comfortably.
#103429
A
wears
B
is worn
C
was worn
D
was wearing
 Various efforts over the centuries _________ to predict earthquakes to reduce the damage. 
#99978
A
are being made
B
have been made
C
were made
D
were being made