Social attention should be paid          our earth from        .    
#102039
A
to prevent; being polluted
B
to preventing; polluted 
C
to prevent; polluting
D
to preventing; being polluted
推荐题目
—When will Mother come back?—She _____ to be here by eight o’clock tonight. 
#103710
A
is supposing
B
supposed
C
was supposed
D
is supposed
They started off at about 5 o’clock in the morning . They should       there by now .
#103835
A
arrive
B
have been arriving
C
have arrived
D
be arriving
 I'll go to the library as soon as I finish what I        .
#101936
A
was doing
B
am doing
C
have done
D
had been doing
— Sorry, I forget to post the letter for you. — Never mind, __ it myself tonight.
#104406
A
I’m going to post
B
I’ve decided to post
C
I’ll post
D
I’d rather post