At the top of the high mountains, there is very _____ oxygen in the air.
Our teacher wants us to answer these questions according ______ the text.
He becomes famous now and gets tons of ________ everywhere he goes.
You__________ a lot in the past few years.
The silent boy has learned how to _________his shyness.
You should try to avoid _________ the same mistake over and over again. A. to make B making C. makes D. Made