--- He’s got our tickets. --- That’s good I afraid that he them.
— Why did the dinner party start so late last night?— It was _____ that caused him to serve dinner an hour later than usual.
---I can’t find Mr. Brown. Where did you meet him this morning?---It was in the hotel _______he stayed. A that B which C where D when
Was it in 1969 _____ the American astronaut succeeded_____ landing on the moon?
It is exactly _____we behave _____has changed the world.
—I can’t find Xiao Ping, where did you see him this morning?—It was in the library______ he studied.