How do you like sit-ups(仰卧起坐)—Very much. I’m good at doing sit-ups. But it won’t be liked by .

With some technical problems to be solved, it may be a while _____the system is put into use[ ]

He _____ be at home, because the light is on.

If I were to have time, I to the theatre tomorrow evening.

It would be very safe if you _____ the door _____ to the garden. [ ]