Hãy dùng định lý Pitago để so sánh đường vuông góc và đường xiên AB kẻ từ điểm A đến đường thẳng d

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I. Put the verbs in the brackets into the present perfect. 1. Susan is in New York. She ________ there since Monday. (be) 2. I know Isabel. I _________ her for a long time. (know) 3. Nancy and Sergio are divorced. They _________ each other since 1997. (not/see) 4. Is Bill sick? He _________ to work for the last few days (not/go) 5. _________ you _________ Harry Potter? (read) 6. How long _________Chris _________in HSBC bank? (work) II. Complete the sentences with form of present perfect or past simple. 1. We (not/ plan) _________________ our holiday yet. 2. He (write) _________________ five letters. He is going to write another five letters. 3. _________she (see) __________ him for a long time? 4. I (do) _________________ my maths homework yesterday. 5. They (visit) _________________ a farm two weeks ago. 6. The children (not/ be) _________________ at home last weekend. 7. When (you/ design) _________________ this wonderful skirt? 8. How many games (your team/win) _________________ so far this season? III. Choose the correct form of the verb to fulfill the blank. 1. Nancy ___________milk every morning. A. drank B. drinks C. drunk D. drink 2. Susan ___________the floor an hour ago. A. sweep B. sweeped C. swept D. sweeps 3. Valerie ___________about being a painter at the moment. A. dreamt B. dreams C. has dreamt D. is dreaming 4. What’s wrong with John? He___________a cold. A. has caught B. caught C. catches D. is catching 5. Children ___________ a snowman yet. A. haven’t made B. don’t make C. didn’t make D. are not making IV. Find and correct the mistakes. 1. The flight to Vientiane have departed. 2. She hasn’t finish the letter. 3. I forget that girl’s name already. 4. Fred’s brother just graduates from university. 5. I am trying to learn English for years. 6. I have been waiting for two hours, but she not come yet. 7. She reads all the works of Dickens. How many have you read? 8. I wait hare nearly half an hour for my gir-friend Joana; do you think she forgets to come? 9. Mary rests in the garden all day because she is ill. 10. Although John has studied at the university for five years he have not got his degree yet. Giúp em vs ạ!!!