______ did you sleep last night?—Only five hours. I stayed up late to do my homework. [ ]
Look! There is a big river. Let’s swim in it!—No, I think it’s _________ dangerous.
The teacher encourages us todiscussions at the English corner.
I would appreciate ______, to be frank, if the goods could be delivered as soon as possible．
I’m glad you’ve come back from the United States. Please tell me how long you ____there.