I know one of the things I was unsure about was _____ hard it would be to climb this mountain.

—English has a large vocabulary, hasn’t it?—Yes. ________ more words and expressions and you’ll find it easier to read and communicate.

____________ make so much noise. The students are taking an exam.

 If the green light isn’t on, ___________ a minute.

The teacher often says, “ _____ late for class.”