She looks very happy. She ____have passed the exam.—I guess so. It’s not difficult after all.

I have been living in London for more than ten years, so I have ________ good knowledge of this city.

ionally, college students hold a graduationceremony to encourage themselves before they ontheir life jouney.

Years ago we didn’t know this, but recent science ______ that people who don’t sleep well soon get ill

‘m willing to help, I do not have much time available．