--Dad, I’ve got an "A" in the math exam. --Great. And I’m sure you will do better, because this is a good_______.
Paper is made ____________ wood. So saving paper is saving forests.
The light bulb is really __________ useful invention.
--- I’ll fly to Qingdao for my holiday this weekend. --- Wonderful! ____________
--- What do you think of the book written by Mo Yan? --- Oh, excellent. It is worth ___________ a second time.
Shanghai is bigger than ___________ in Japan.