This is a kind of traditional classroom teachingstudents are taught a lot about grammar rules.

It is ___ __ that Armstrong sent a message _ _____ that UFO appeared when Apollo 11 landed on the moon.

Mrs Green wants to buy that kind of cloth because she ____ that the cloth ____very well

I just wonder that makes him so excited.

（题文）______ expense, we must take every measure to save the old man’s life.