Is it always easier ____ friends than to keep them?
| A．making | B．make | C．to make | D．made |
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The professor explained this theory so clearly that this phenomenon was easy enough ________.
| A．for us to work out | B．working out |
| C．for working out | D．to working out |
—Mike, our team will play against the Rockets this weekend. I am sure we will win.
—_________.
| A．Congratulations | B．Cheers | C．Never mind | D．Good luck |
He has devoted himself __ mankind.
to benefit B. benefiting C. to benefiting D. benefited
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