The black box is a necessary device on an airplane, which records its speed, direction and whether everything on the airplane______ normally. 

——I’m sorry , but there’s no smoking on this flight ．——Oh, I _______that ．Sorry , I won’t again ．

Exciting as its special effects are ______, there is too much violence in the film.

I’m sure you will do better in the test because you ________ so hard this year.

I would have gone to visit him in the hospital had it been at all possible, but I_______ fully occupied the whole of last week.