I don’t know _______ / we? / Mr. White comes from?
Math is boring and difficult.
Linda’s father isn’t an engineer. Her mother isn’t an engineer, ______ .
What do you think of the book A Haw Tree written by a woman writer? —It reminds me of the days _______ I spent in the countryside. [ ]
The first thing ______ I am going to do this evening is to go to sleep.