---Do you know about a very popular toy--- the yo-yo(悠悠球)?---Yes. Filipinos(菲律宾人) invented it ________ accident. And it ________ helping kill animals.
_______ is said that _______ tourists visit the park every day .
When I was at the college , I _______ up early to do some body building exercise .
--- Did you see a girl in yellow pass by just now? --- No, sir. I ________ a magazine.
--I’m worried about tomorrow’s math exam. -- ______ . I’m sure you will make it.
Though Lin Tao’s parents work in another city, he can ______ himself.