--- Whose French book is it?
--- It __________ be Lucy ’s. Look! Her name is on the book!
A、mustA
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Beforeyouleavetheclassroom，please__thelights.
Chairperson Xi calls on us to do what we can_______ as much as possible.
Thankyouforthe_______thatyougavemewhenIfeltEnglishtoodifficulttolearn.
After a short time, the bad news had_______ all over the city and everybody knew it.
--- _______ do you play computer?
--- Once a week, only on Saturday evening.
