Something ___ to save our earth. Do you think so?
#88938
A
can do
B
must do
C
has to do
D
must be done
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What would have happened____, as far as the river bank? 
#89939
A
if Bob has walked farther
B
if Bob should walk farther
C
had Bob walked farther
D
if Bob walked farther
What a kind teacher. But for his help, I __________ my study.
#86462
A
wouldn’t finish
B
wouldn’t have finished
C
shouldn’t have finished
D
mustn’t have finished