“Simpler” books are the foundation ______ students build a lifelong habit of reading and further the actual skill of reading for longer and stronger periods of time.

I walked in our garden, _____ Tom and Jim were tying a big sign onto one of the trees [ ]

________Switzerland (瑞士) is very small , _______it is the land of watch and it is very rich.

— Can those _____at the back of the classroom hear me?— No problem [ ]

They wanted to charge $5,000, ______ we managed to bring the price down.