The old people enjoy ______ (recall) to the old time things.
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Books ______ (write) in easy Chinese are very popular among middle schools of Britain.
Our society ______ (survive) without scientific and technological knowledge.
—Hi! John. I didn’t see you at the party last night. —Oh, I ______ (get) ready for the English exam.
Mary didn’t know where ______ (find the key).