Ms.Lin has much ________ of teaching.She is a wonderful teacher.

You know, Bob is a little slow _____ understanding, so…— So I have to be patient _____ him[ ]

rry I didn’t phone you, but I’ve beenvery busy_____ the past couple of weeks.

Linda’s mother used to be ________ university teacher. She taught maths.

She wrote a month ago, ______ we’ve heard nothing.