_____ a cold morning poor Mary went out to sell flowers. [ ]

What’s wrong?—I can’t do my homework now. Imy homework in the classroom this morning.

“Frog”, Mo Yan’s latest novel（小说）, please! — Sorry, it ________ just now. But it will come out again soon.

The old man _______ since ten years ago.

After eight hours’ hard work, the firemen the big fire at last.