动词填空  (本大题共8分，每小题1分)
_________ (make) the little baby stop crying, he tried all the ways he could think of.
-- What’s the noise?
--- Oh, the students ___________ (plan) their autumn trip excitedly.
The radio says the temperature ___________ (drop) a lot later today.
The Smith __________ (fly) back to New York three days ago and they will come back in two days.
I got up early in order __________ (not be) late for school.
--- Why didn’t she stop him going out?
--- Sorry, but she ___________ (write) a letter and didn’t see him go out.
Mr Wu told us that light __________ (travel) much faster than sound.
I can’t understand why such a story made him __________ (laugh) so happily.