Ⅰ.用适当的介、副词填空
1．Science is developing faster than we can ________ think about it.
2．However，________ general the scientists were praised ________ their wonderful scientific advance.
3．Instead，he thinks research efforts should concentrate ________ creating new tissues and organs that can be used to cure diseases like cancer.
4．Cloning human embryos ________ the intention of destroying them shows no respect ________ human life.
