I saw a strange cloud _______ questions _____ it in the game.
The interviewer asked Detective Lu _______________.
You had better ________ some time every day for sports so that you can keep yourself energetic.
All of the doctors have worked for a long time, but ________ of them stop to have a rest.
It’s raining heavily. I’d rather ________ in bed ________ out.
Having ________ exercise every day will do great good to your health.