He asked me how much on the mountain bike.
| A．did I pay | B．I paid |
| C．had I paid | D．I had paid |
Nobody knows _______broke into the house last night and stole the important papers.
| A．who was it that | B．it was who that | C．who it was that | D．that it was who |
—Do you think the thief entered through the back door?
—No, if he had, I don’t believe he ______ the living-room window.
| A．would break | B．broke | C．would have broken | D．had broken |
Go and join in the party. Leave______ to me to do the washing-up.
| A．it | B．that | C．this | D．one |
One of the rules is that under no circumstances _______to bring food, drink or chewing gum into the school.
| A．students are allowed | B．allow students |
| C．are students allowed | D．students be allowed |
After decades of effort, the city is still trying to _____ how to stop smoking in public places.
| A．try out | B．let out | C．figure out | D．run out |