It is well understood controls the flow of carbon dioxide in and out the atmosphere today. A．t——青夏教育精英家教网——

It is well understood _____ controls the flow of carbon dioxide in and out the atmosphere today.

No sooner had we reached the top of the hill _____ we all sat down to rest.

The reason for the party was _____ it was Sue’s birthday.

_____ quite recently, most mothers in Britain did not take paid work outside the home.

I have kept that portrait _____ I can see it every day, as it always reminds me of my university days in London.

You see the lightning _____ it happens, but you hear the thunder later.

A．the instant

B．for an instant

C．on the instant

D．in an instant

They decided to chase the cow away _____ it did more damage.

_____ he works hard, I don’t mind when he finishes the experiment.

_____ you are familiar with the author’s ideas, try reading all the sections as quickly as you possibly can.

_____ or not we had a baby, we couldn’t survive only on my salary.

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