We all know that dinosaurs lived on the Earth more than ______ years ago.
---- Ken, it is wrong to _____ the weak. Don’t do that again. ---- Sorry, _______.
----What ________ the number of the students in your school? ---- About two thousand. A number of them _______ from America.
----What were you doing _________ 8 last night? ----- While I was wandering in the street, I noticed a wallet __________ on the ground.
---- Don’t jump the ______. Go and wait your _____, please. ---- Oh, I’m sorry.
----Which would you like , tea or coffee ? ----_________ is OK. I don’t mind.