________conversations with others is one of the secrets to ________a successful learner.

The old man lived alone all his life and he_______ a rainy winter evening.

Studies show that kids living and studying in a harmonious environment are less likely to become .

The weather here in summer is so changeable. Pleasetake an umbrella when you go out. —________.

What’s the model plane look like? — Well, the wings of the plane are ______ of its body.