—— Do you still remember the day when we went to the Great Wall? —— I can’t remember it well, but＿＿＿＿＿＿sometime last autumn? 

It's dark, Mum ___ be waiting for my return.

But for the sudden rainstorm, our trip to Hong Kong _____ a very pleasant one.

Mr. Smith insisted that his book _______within three days.

—___John come here tonight?—I’m not sure, but he ______ stay at home.