B. the meal costs, paid C. the meal spends, paid D. the meal costs, paid for
解析：首先宾语从句用陈述句语序，A可以排除。cost表示某物花多少钱，spend 花费时间或金钱，一般人做主语。pay表示付钱，pay for 为....支付了多少钱。答案是B。
44. ---Does the child need any help? ---No. He is old enough to _____ himself. A. put on B. wear C. dress D. take care
解析：put on 强调穿的动作，wear强调穿着的状态，dress后面接人做主语，dress sb.给某人穿衣，dress oneself给自己穿衣，take care of 照顾。答案为C。
45. ---There can be no life on the earth without water. ---That?s right. Water _____ everywhere. A. needs
B. is needing C. is needed D. needed
解析：本题是没水就没有生命，水在任何地方都被需要，被动语态，答案为C。
46. ---Were you late ____the meeting?
---No, I arrived there ten minutes______ the meeting started. A. for, before B. at, before C. for, till D. at, after
解析：be late for 固定用法 “为......迟到” ---为什么你开会迟到? ---不，我在开会前十分钟到的。答案为A。till 直到 after ...之后，before ...之前。
47. ---Excuse me, but I don‘t think you can take photos here. ---Sorry I ____ this is no-photo zone. A. don’t know B. didn‘t know C. have no idea D. haven’t known
解析：根据题目意思可看出对方是以前不知道这里是不允许照相的区域，用过去时，答案为B。
48. ---How many English words had you learned ___ the end of last term?
---Around 2000, but I?ve forgotten most of them. A. by B. at C. to D. on
解析：by the end of 到....为止,如果后面接将来时间，主句用将来时，如果后面是现在时间，主句用现在完成时，如果是过去时间，主句用过去完成时。at the end of “在...尽头”后面接时间时，一般用过去时或将来时。答案为A。
49. ---Are you learning art now during your spare time? ---No. I've stopped _____ Chinese medicine instead. A. to learn B. learning C. learn D. studying
解析：---你现在在空闲时间学习艺术吗?---不，我已经停止了，在学中医。stop to do 和stop doing分别表示“停下来去做某事”和“停止做某事”答案为A。
50. ---What did you ____ just now? ---I _____ you if you could follow me. A. say, said B. speak, asked C. speak, said D. say, asked
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