Researchers have found clear and convincing evidence ________ happiness isthe key to better health and longer lives

These boxes are too heavy for me to move—Here, I’ll give you a hand ________ them

Li Hua is not likely to __________ his way of living __________ the new life style in the city, for he has lived in the countryside for a long time.— On the contrary, he does it very well.[ ]

In China, many people often take ______ own bags when shopping.

The last one ________ the meal washes the dishes–Agreed!