Câu 2: Để nâng vật có trọng lượng 10 000 N ta phải tác dụng vào pittong nhỏ một lực là bao nhiêu? Biết pittong lớn có diện tích gấp 50 lần pittong nhỏ

VI. Write these sentences, putting one verb into the correct form of "used to" and the other into the past simple. (1 động từ chia used to + verb /1 từ chia ở quá khứ) 1. He (live) in London before he (go) abroad. 2. I (earn) a lot of money, but then I (lose) my job. 3. I'm surprised that they (join) the tennis dub. They (not/ like) tennis. 4. you (travel) a lot before you (become) a teacher? 5. That radio (work) before I (drop) it. 6. We (see) them every week, but then we (have) an argument. 7. She (play) tennis a lot before she (break) her leg. 8. She (drive) a lot before she (have) an accident. 9. We (have) a garden, but then we (move) to a different house.