Chứng minh MA.MB=ME.MF suy ra MA.MB=MC. (MC+2R) giúp mình với

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I/ Combine these pairs of sentences, using “ Who,Which, ” 1/ The lesson is not easy. The teacher is explaining the lesson. ......................................................................................................................................................... 2/ The man is very rich. He is talking to my father. ......................................................................................................................................................... 3/ I have just bought a new computer. Its screen is very good. ........................................................................................................................................................... 4/ Easter is a festival. It occurs in late March or early April. ............................................................................................................................................................ 5/ Mrs Nga is a famous tailor. She is very much interested in fashion. .................................................................................................................................................................. 6/ The Taj Mahal is one of the wonders. We visited it last week. ............................................................................................................................................................. 7/ Tom and his sister didn’t come to the party. They were invited. ............................................................................................................................................................. 8/ The shoes are too large. My teacher is wearing them. ............................................................................................................................................................. 9/ This is the best movie. I have never seen it before. .............................................................................................................................................................. 10/ Lan’s father is very tall and thin. He teaches us Chemistry. ............................................................................................................................................................. II. Choose the best answer. 1. Your aunt, (which/ who/ which/ that) answered my phone told me you were out. 2. It’s nice (in/ at/ on /of) you to say so. 3. Let me congratulate you (in/ on /to / at/) your good result. 4. You: Well done , Lan Lan: (O.K/ That’s a good idea/ That’s very kind of you/ Of course). 5. The man and the elephant (who/ which / whom/ that) you saw on TV last night are from Africa. 6. She turned (on/ up/ down/ up) the TV to see a cartoon. 7. Do you know the man (who/ which/ whom/ that) you met yesterday. 8. Last night we came home early (because/ although/ since/ but) the traffic was terrible. 9. Tet is a festival which occurs in late January or early February. (begins / happens/ carries/ begins). 10. I understand your idea. (Although/ Therefore/ However/ Because), I don’t agree with you.