According to Charles Keeling, the amount of carbon dioxide ________ sharply and steadily over the forty years between 1957 and 1997.
| A．increased | B．had increased |
| C．had been increased | D．was increasing |
—Nothing wrong with it, ____?
—Yes. The computer says, “Please check this disk before entering data.”
| A．is it | B．has it | C．does it | D．is there |
--- Could you introduce me a high quality car?
--- My pleasure. ____ well even on wet roads, this kind of car is very popular.
| A．Handled | B．To handle | C．Handling | D．Being handled |
— Has Yang Liping returned from Yunnan yet? I’d like to meet her.
— Sorry. She ____ back here only for last weekend.
| A．has been | B．would be | C．had been | D．was |
In 1948, three American scientists invented ____ transistor, which is ____ small electronic device to control an electric current.
| A．the; a | B．a; a | C．the; the | D．a; the |
I don’t understand why the boss should __________ the girl, because in my opinion, it was her fault that caused the loss.
| A．make out | B．leave out | C．let out | D．put out |