(单选题)23: It is pretty well understood _________ controls the flow of carbon dioxide in and out the atmosphere today. A: that B: when C: what D: how ...

(单选题)25: I _____ you some money, but I hadn’t any on me then. A: would lend B: would have lent C: could lend D: may have lent ...

(单选题)7: _________ she couldn’t understand was __________ fewer and fewer students showed interest in her lessons. A: What; why B: That; what C: What; because D: Why; that ...

(单选题)2: There’s a feeling in me ___________ we’ll never know what a UFO is. A: What B: which C: of which D: That ...

(单选题)16: I _________to help you but couldn’t get here in time. A: want B: had wanted C: have wanted D: was wanting ...

(单选题)10: When I reached home, my parents __________their supper. A: are having B: have already had C: have had D: had already had ...

(单选题)4: You _____ be careful when you cross here --- the traffic lights aren’t working. A: could B: might C: ought to D: may ...

(单选题)15: She was so angry at all ________ he was doing _________ she stayed up all night. A: that; that B: that; which C: what; that D: what; as ...

(单选题)16: Workers in this company are paid ( ). A: by the week B: to a week C: for a week D: in the week ...

(单选题)24: We should face the challenge (). A: brave B: confidence C: confident D: confidently ...