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 |
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31．—Will you go fishing with me?
—___________.
| A．No, I'll be very busy | B．Yes, I'll be glad |
| C．Certainly, I'll be sorry | D．Certainly, I'll be glad to |
30．The British are not so familiar with different cultures and other ways of doing things, ___________ is often the case in other countries
| A．as | B．that | C．so | D．It |
29.-----I _____to go for a walk.
-----But I_____ going shopping.
| A．would like; feel like | B．feel like; feel like |
| C．feel like; would like | D．would like; would like |
28．—Thank you very much.
—Not at all , I was____________ glad to help.
| A．too | B．only too | C．not so | D．much |
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