We forbid ______ in the lecture hall, so you are forbidden _____ here

---Let’s go to the lecture on International Trade this evening.　　---That’ s great. I’ll _____ you at 6: 30.

.Emergency line operators must always ______ calm and make sure that they get all the information they need to send help.

My headmaster usually ___his speech with a funny joke .

The officer made his men_________his order at once.