---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.
You’d better speak aloud ______ we can hear you.
Xiao Li had an accident yesterday _____ he is in No.1 People’s Hospital now.
—Lily, _____ you _____ your ticket? —Not yet!
—What class are you in? —I’m in ____, ____.
—____ your sister know Tom? —No, she ____.