Scientists are convinced___the positive effect of laughter___physical and mental health.()
Mrs. Smith finds it hard to clear up the mess, as her children are alwayswhenever she tries to.
Old-fashioned phones matter when wireless networksin disasters.
The book tells stories of the earthquake through the eyes of those ____ lives were affected.
The girl has a great interest in sport andbadminton classes twice a week over the last three years.
The Forbidden City attracts a _____ stream of visitors every day, especially during national holidays.