A survey of health researchers ______ that four hours of exercise every week ____ good for our health.

The number of people ________ this happens is not verylarge

I’m sorry I made a mistake!–Nobody is perfect

We should use methods to deal with different incidents. You know, anything can happen in that situation.–I got it. Thank you for reminding me.

I _______ there little more than a week when I set to work with the scientist