What did the teacher say just now? — Sorry, I didn’t hear it. I out of the window.

_____ many times, but he still doesn’t know how to operate the machine properly.

There are_________ students in my school._________ students in my school is over 5000.

________of the chemical factories in their city _________pouring waste water into the river. It’s too dangerous.

In the United States, Father’s Day falls on ________ third Sunday in ________ June.