著名的天文学家、自然科学先驱____，用“日心说”否定了影响人类达千年之久的“地心说”．

鱼在水中通过尾部和____的摆动以及____的协调作用游泳．

 设l，m为两条不同的直线，α为一个平面，m∥α，则”l⊥α”是”l⊥m”的（　　）

用所给单词的适当形式填空
(1)I love places where the people are really ____  （friend）.
(2) I want to go there, because I like____ （excite）vacations.
(3) Could you please ____ （give）me some____ （suggest）for vacation spots?
(4) Would you like ____  （drink）some orange juice?
(5) You look tired, why not ____  （have）a short rest?
(6) His brother is considering ____  （study）abroad.
(7) Do you plan on____  （stay）overnight here?
(8) Most private cars ____ （not allow）in downtown Singapore.