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 |
I asked my boss for a month’s holiday and, _________, she agreed.
| A．what’s more | B．that is to say | C．in other words | D．believe it or not |
The boss of the company had _________ his friend’s good advice, which led to the failure of his business.
| A．considered | B．suffered | C．ignored | D．discussed |
My son has changed so much that I could hardly __________ his voice on the phone.
| A．recognize | B．realize | C．hear | D．find |
He must be leaving our village because he is __________.
| A．making up | B．packing up | C．setting up | D．getting up |
The teacher asked us __________ so much noise.
| A．don’t make | B．not make | C．not making | D．not to make |