21．—Would you like another cup of coffee?
—__________．
A．Yes, I like some B．Yes, I’d like to C．Yes, please D．Yes, go ahead
22. —Do you have __________trouble finishing the work?
—No． in fact we have finished it already．
A．much B．some C．any D．no
23. The bike hit the tree __________ I could get off.
A. as B. before C. until D. while
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