There is no night on. They _____ be at home. A can’t B mustn’t C needn’t D shouldn’t
The visiting professor _____ giving lectures to students ______ invited to meetings at times.
It’s nice _______ me with my lessons.
Please give my _____ to your teachers.
It’s ______ here; we can’t work long hours here.
Tom studies harder this term. _______, he has made great progress in his lessons.