1．You must be _______（饿了）! Come and have lunch.
2．I am now ______（收集） convincing information for my paper.
3. My father told me he hadn’t much ____（信任）in doctors of traditional Chinese medicine.
4. It is hard to know the _____（起源） of the human race, that is, how the human race came out.
5．No one is to see the document without the _____（许可） of the writer of the report.
