根據(jù)漢語意思完成英文句子。
1. 微波爐可以用來煮飯。
A microwave oven can _____ _____ _____ cooking.
2. 你必須親自去簽收,他們不能郵寄過來就算完事。
You have to go sign for it _____ _____, they can't just mail it.
3. 人類怎么會(huì)說這么多種語言,這種情況是如何產(chǎn)生的呢?
How did it _____ _____ that humans speak so many different languages?
4. 老師告訴我們噪音對我們的耳朵傷害很大。
The teacher told us that noise _____ very _____ _____ our ears.
5. 在每一項(xiàng)發(fā)明被發(fā)明出來之前,愛迪生總要做大量的實(shí)驗(yàn)。
Before each invention was invented, Thomas Edison always did _____ _____ _____ _____.