一、单词拼写（每题5分，共50分）
1.___________(假定）that Tom refuses our invitation，what should we do?
2.The camera is able to record its subject to an _________(精确）of one millimetre.
3.He has no __________(可能的选择）but to try hard to finish it on time.
4.As long as he is at home, the house is always __________(凌乱的;脏的).
5.It’s not polite to __________(插嘴) when someone is talking.
6.__________(使锋利) all your pencil before the test.
7.They found a __________(原始的) necklace in the cave.
8.He didn’t mean to,but he__________(删除) the files by accident.
9.He doesn’t seem to have quite realized its true _________(意义).
10.Few of the early books have been ___________(保存).
