—It’s 9:15 now. What class ?—Math. They have a math class every day.
-Shelly, it’s cold today!_______put on more clothes?-Ok.
It is said there are ______ of people in the city of Wenzhou.
Tu Youyou is famous ____ her medical research and won the Nobel Prize this year.
-Is everyone here today? -No, Jack is at home____ he is ill.
You should take____ umbrella if it rains.