Many teens don’t have enough sleep because they have too much homework, which ______ them up at night.
I'm very sorry to have __________ you with questions on such an occasion.
Don't forget where the emergency exits are __________ an emergency.
My sister is very stubborn, so it is __________ to change her mind.
Just as I don't know what to do next, it suddenly __________ me how we could improve the situation.
The students are forbidden, unless they have special passes, __________ after 11 p. m.