—I don’t suppose they could have finished their experiment,      they?—       , they are still doing it in the lab.

He ___ work in Hangzhou, did he?

 It was Mr. Zhang that helped us out of the trouble. Without his help, we ______ it so easily.

If I hadn’t stood under the ladder to catch you when you fell, you _____ now.

—I promise that she       get a nice present on her birthday.—It will be a big surprise to her.