—How do people do bird-watching? —Sometimes they______the birds quietly,  sometimes they use telescopes. 
#72866
A
catch
B
cast
C
approach
D
Shoot
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When I entered, I found my father ______ on the sofa and ______ in a magazine.
#77837
A
sitting; absorbed
B
sit; absorb
C
sitting; absorbing
D
sat; absorbed
If we_________ sunlight_________ a dry leaf with a piece of glass, it may start burning.
#70485
A
work; out
B
carry; out
C
focus; on
D
concentrate; on
How much does that      ?
#69395
A
add
B
add up
C
add to
D
add up to