I、单项选择：
1、It was _____ he said _______ astonished us all.
A. what , that B. that , that C. what , what D. that , what
2、____ this material can be used in our factory remains to be seen.
A. When B. What C. That D. Whether
3、____ knows the truth about it will tell you.
A. Who that B. That C. Whoever D. That who
4、Energy is_______ makes things work.
A. what B. something C. anything D. that
5、I will give this dictionary to ___ wants to have it.
A. whomever B. whoever C. whom D. whatever.
6、The teacher told them since light___ faster than sound, lightning ___ to go before thunder.
A. traveled, appeared B. travels, appears C. travels, will appear D. traveled, would appear
