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1.- It's a secret. You____tell anyone.
a) must
b) must not

2.- It's very late. We_____go now.
a) must
b) must not

3.- You____lose these papers. They are very important. 
a) must
b) must not

4.- You___lose those wires. It's dangerous. 
a) must
b) must not

5.- Go now but you__be back before noon.
a) must not
b) must