Câu 15. Một vật có khối lượng 312g và thể tích là 0.00004m3. Em hãy tính khối lượng riêng, trọng lượng riêng của chất tạo nên vật đó theo đơn vị kg/m3 và N/m3 . m.n giúp mình với. mik cảm ơn m.n nhiều nhiều. mik đg gấp lắm ạ.

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Exercise 2: Combine these pairs of sentences, using “who, whom, which, why, when, that or whose” 1. The old man is my grandfather. He lives next door. _________________________________________________________________ 2. I met someone. He said he knew you. _________________________________________________________________ 3. The trousers are too small for me. I bought them yesterday. _________________________________________________________________ 4. The man is a computer expert. You were talking to him. _________________________________________________________________ 5. The new stadium will be opened next month. It can hold 90,000 people. _________________________________________________________________ 6. This is the book. It talks about a famous blind musician. _________________________________________________________________ 7. The postcard was from Harriet. It came this morning. _________________________________________________________________ 8. Can you tell me the time? We can start at the time. _________________________________________________________________ 9. Please tell me the reason. You come late for that reason. _________________________________________________________________ 10. The ladder began to slip. I was standing on the ladder. _________________________________________________________________ Exercise 3: Complete the following conditional sentences using the correct form of the verbs in brackets. 1. If we send an invitation, our friends (come) _______ to our party. 2. If he (give) ______ up smoking, as his doctor orders, he will be soon well again. 3. You must (not leave) ______ the house unless I allow you to go. 4. You (not pass) ______ your driving test unless you drive more carefully. 5. If Claire wears this dress at the party, her friends (be) ______