1. They wanted to ________ how the parts of the machine fitted together.
2. A number of social factors________ life expectancy.
3. The boss wanted to ________the number of employees from 40 to 25.
4. It is not a good idea to miss meals and________ them with snacks.
5. There are hundreds of people desperate to ________a child.
【答案】1. C 2. B
3. A 4. E
5. D
