2. If you are late, you will miss an important part of the lecture. 3. If each of us buys less and recycles more, we can reduce waste at home. 4. If you don't hurry up, you will be late for school. 5. If you don't go away, Anna will call the police. 6. If John helps Jenny to do this task, she plans to pay him more. 7. If Sara wants to buy a new laptop, she borrows my money. BỊ ĐỘNG THỜI QUÁ KHỨ 1. The light bulb was invented by Thomas Edison in 1879. 2. The liquid-fueled rocket was invented by Robert Goddard in 1962. 3. The table was moved to the living room yesterday. 4. Two factories were closed because they caused too much air pollution. 5. A bus system was developed to improve transportation in the community. BỊ ĐỘNG CỦA ĐỘNG TỪ KHUYẾT THIẾU 1. Members' personal belongings can be kept in lockers. 2. Phone calls should be answered outside of the gym so as not to disturb other members. 3. Electronic devices must be turned off before take-off. 4. An exam may be given by our English teacher today. 5. The game should be canceled. 6. She can't be persuaded by the doctor. 7. My car needs to be repaired by them.