It is pretty well understood ________ controls the flow of carbon dioxide in and out the atmosphere today.
| A．that | B．when | C．what | D．how |
It’s difficult for him to without a car.
| A．get off | B．get in | C．get on | D．get around |
The company alwaysgreat importance to the quality of their products. That’s why there is always a steady increase in sales year by year.
| A．puts | B．attaches | C．makes | D．plays |
Although she had been ill for a long time, it still came as a shock when she died
| A．eventually | B．willingly | C．unexpectedly | D．disappointedly |
The reasonhe explained at the meeting washe has no time to finish the work.
| A．That; why | B．why; why | C．that; that | D．why; that |
