A new technique_________, the yields as a whole increased by 20 percent.
| A．working out |
| B．having worked out |
| C．having been worked out |
| D．to have been worked out |
---Volunteering is becoming popular in China .
--- Yeah, people are now aware that helping others is helping themselves.
| A．naturally | B．successfully | C．thoroughly | D．increasingly |
The computer systemsuddenly while he was searching for information on the Internet.
| A．broke down | B．broke out | C．broke up | D．broke in |
---Sorry, but I can’t visit you tomorrow.
---Come whenever it is to your.
| A．pleasure | B．convenience | C．preference | D．connection |
---Did Peter fix the computer himself?
---He, because he doesn’t know much about computers.
| A．has it fixed | B．had fixed it | C．had it fixed | D．fixed it |
the lack of water and food, the homeless have to deal with the cold weather.
| A．As well | B．In spite of | C．Apart from | D．In danger of |