21．--- Let’s discuss the question raised last night, shall we?
--- There is no hurry for that. I for a conference.
A．headed B．was heading C．am heading D．have headed
22．It took the early settlers more than 150 years to build up is now a modem city.
A．where B．which C．what D．that
23．--- I try to memorize new words every day, but can only remember few of them.
--- That’s not surprising. Newly – learnt words are easily forgotten unless frequently in communication.
A．used B．using C．to use D．be used
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