— It’s the office! So you        know eating is not allowed here.— Oh, sorry.

--- I spent two weeks in London last summer. --- Then you must have visited the British Museum during your stay, _______ you?

—David is often absent from class.—Tell him he ________ answer for it if he goes on behaving like that.

--It is really fun to hike and I often go hiking in the forest.--But hiking alone in the forest ______ be very dangerous.

 －_________ we go at 7.30 ? －What about __________ it a little earlier ?