It _________ be the only way to solve the problem. There are other choices.
may not
mustn’t
need
should
You can’t imagine _____ when they received these nice Christmas presents.
Many students enjoy the book about Harry Potter _____ by JK Rowling.
—Don’t stay up too late or you’ll feel sleepy in class. —OK. I’ll go to bed as soon as I _____ my homework.
—Is Jim playing computer games in his room? —No, he _____. The computer has broken down.
Mike _____ at 6:00 every morning by his mother to get ready for school.