To understand the grammar of the sentence,you must break it______ into parts. 
#4913
A
down
B
up
C
off
D
out
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—Tom came back home the day before yesterday.— Really? Where __________ at all?
#4818
A
had he been
B
has he been
C
had he gone
D
has he gone
  —I think everyone has a role to play in making the planet a better place.—Yes, indeed. ______.
#4622
A
I’m with you on that
B
That couldn’t be better
C
You have got something
D
I’ll do my best
________by the beauty of the West Lake, Mary decided to stay for two more days in Hangzhou.
#4728
A
Attracting
B
To be attracted
C
Attracted
D
Having attracted