Billy is a  nice  boy . he knows a lot , but he never ________.
#54021
A
shows off
B
picks up
C
falls off
D
looks up
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 When the old man saw some litter on the ground, he quickly          .
#62853
A
picked it up
B
picked up it
C
picked them up
D
picked up them.
After school,I often ________Simon to go home together.
#61556
A
meet up
B
meet up with
C
see with
D
meet on with