[ Prepositional Phrases ]
The majority of holiday flights depart and arrive _____.
A. on schedule
B. on the agenda
C. on tiptoe
D. on order

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Coordinate Conjunction › ViewI need a pen _________ some paper to write some notes.
A. and
B. but
C. for
D. so
Grammar › View
I _____ up all night if I have a lot of homework to do.
A. stayed
B. staying
C. stay
D. stays