Computers in offices and homes since 1970s．
| A．have been used | B．had been used | C．was | D．has been used |
________ you eat the correct foods ________ be able to keep fit and stay healthy.
| A．Only if；will you |
| B．Only if；you will |
| C．Unless；will you |
| D．Unless；you will |
—He says that my new car is a ________ of money.
—Don’t you think those words are just sour grapes?
| A．lack |
| B．load |
| C．question |
| D．waste |
Scientists have many theories about how the universe ________ into being.
| A．came |
| B．was coming |
| C．had come |
| D．would come |
After his vacation，he was in fine ________ both physically and mentally.
| A．condition |
| B．state |
| C．situation |
| D．shape |
It is worth considering what makes “convenience” foods so popular，and ________ better ones of your own.
| A．introduces |
| B．to introduce |
| C．introducing |
| D．introduced |