A solar day is the length of time _________ the Earth to revolve once around the sun.
A. takes
B. takes it
C. it takes
D. taking
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___________ from the sun _________ we get light and heat.
A. It is ... that
B. It was ... that
C. It must be ... that
D. It can be ... that
-- Who is making so much noise?-- ________ must be the children.
A. They
B. There
C. These
D. It
-- When can we come to visit you?-- Any time you feel _________.
A. one
B. like it
C. so
D. for it
_________! We'll back you up.
A. Hang it all
B. Take it easy
C. That's it
D. Go it
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