I think it’s unusual thing to find a UFO.
Boys and girls, please don’t forget _______ your homework here this evening.
—Don’t run in the hallways, boys. It’s too dangerous.—________.
One of the ________ in our class ________ from America.
—Please don’t _______, Tommy. Your sister is sleeping now.—OK, mom.
Tony is ______ lazy, and he is not good at learning English.