It was a pity that when we hurried to the lecture hall, the lecture_________, so we heard only the end and missed most part of it

Every day, my mother tries to spare some time to chat with me _____she is very tired after a whole day’s hard work.— How great she is!

Tom,you and I could hardly work out the mathematic problem, _______?

my pencil-box. It’s nice.

I asked but no one ．Was the question too difficult