课件7张PPT。M7 U1 WorkbookD2 He is always uncertain about what to do when he is at home alone.2. The wealth of a country should be measured by the health and happiness of its people, as well as by the materials it can produce.3. I am not familiar with the names of chemicals, which is why I often get a low mark in Chemistry examinations. 4. When you apply for a job, you should offer your personal information in detail. 5. The supermarket has brought us great convenience since 1999, when it opened. 6. The employees’ demand for higher pays was turned down by the employer. 7. The professor came into the lecture hall accompanied by several assistant teachers. 8. Food is closely associated with the body. That is, food supplies the body with energy.