I am afraid it was a ____ for you to do this.

During these ten years, many new methods have been ___ in thefield of foreign language teaching.

That is ___ behavior and nobody likes it.

The first paragraph is intended to ________.

Advertisements are aimed at people suffering from mild complaints because________.

将教育研究分为描述研究、相关研究和因果研究的分类依据是

We can conclude from the passage that ________.

Learning to cope with a health problem can contribute to a better life.

A new plane is going to ______ by us.

To obtain a satisfactory result ， one must apply two（） of paint on a clean surface.