---What__ Amy __?

---She's writing an e-mail to her pen- friend.

常用的直流斩波电路有降压斩波器、升压斩波器、( )等。

In Canada there are two official languages, English and ______.

把5克食盐溶75克水中，盐占盐水的

建国以来，小学语文教学取得了很大成绩，但仍有许多弊端，旧根难除。在1978年，一位著名学者对语文教学的 " 费时甚多，收效甚微" 现象提出批评，他是

The English language teaching business will become the victim of its own success,______ may be astonishing to you.

技能培训指导的一般方法有现场讲授法、(  )、指导操作和独立操作训练法等。

小学阶段说话训练总的要求是

Thinking helps people control their own destinies. Those who avoid thinking run therisk of ______.

英语课程资源的核心部分是 ______。