The researchers found clear and convincing evidence _______ happiness is the key when it comes to better health and longer lives.
Hiking by oneself can be _______ and good for health. It may also be good for_______ training.
Though _______ abroad for years, many Chinese still ______ the traditional customs.
In winter, the town is often _____by snow.
His subtle acting made _________ people laugh, feeling more _______ their lives.
Farmers here _________keeping the soil rich and _________diseases.