She looks very happy. She ______ have passed the exam.–I guess so. It’s not difficult after all.

You’ve agreed to go, so why aren’t you getting ready—-But I _______ that you wanted me to start at once.

Tell John not to leave the house unless he ________ that the lights ________.[ ]

My good friend Lucy can _______a little Japanese.

下列各句中，没有语病的一句是（  ）