2 . As the educator puts it, ________ (expand) your knowledge by reading more books is a wise choice. (所给词的适当形式填空)

3 . 这促进了当地经济的发展，进一步扩大了它们的影响。
This has promoted the development of local economy and further ________________.

4 . Flexibility training helps________ your muscles and improve your body’s range of movement.

A．extend

B．stretch

C．expand

D．spread

6 . The plan to ______________ (扩展) the company overseas was a complete failure (根据汉语提示单词拼写)

7 . Many measures have been taken to ________ awareness of environmental issues.

A．clarify

B．expand

C．switch

D．promote

8 . Through intense efforts, Yuan _______________________ to develop the first hybrid rice that could be used for farming in 1974. This hybrid enabled farmers ________________________.(根据课文内容填空)