根据句意和提示写出单词，完成句子。每空一词。
小题1:We should brush our ________________ (牙齿) after each meal.
小题2:On his mother’s ________________ (四十) birthday, he gave her a card and some flowers.
小题3:Does your father like _________________ (看) newspapers?
小题4:You may _________________ (借) the book for two weeks.
小题5:Now mankind is exploring those ___________________ (未知的)outer space in many ways.
