Little Mary says good night to her parents________ she goes to bed every day.
句意：小玛丽每天睡觉前都会跟父母说晚安。
考查连词辨析。if如果；until直到……；before在……之前；unless除非。根据句中“says good night to her parents”和“she goes to bed”可知，此处是“睡觉之前向父母说晚安”。故选C。
Little Mary says good night to her parents________ she goes to bed every day.
—Hello, Linda speaking. Who’s ____?
—Hello, this is Martin.
I find ____ necessary to learn about the customs of a country before you go there.
—Much personal information is stolen when people buy things on the Internet.
—Terrible! _____ must be done to keep the Internet safety.
—Where would you like to go this Mid-Autumn Festival?
—I’d like to go ____.
—It’s sunny outside. Why not go out and have a look?
—There ____ is here. I just want to have a rest.
There is ___ juice in the fridge. I must go to the supermarket at once to buy some.
____ of my time is spent on learning. So I have made much progress in my study.
Most students are playing on the playground and there are still ____ students staying in the classroom．
My twin brothers promised my parents to give up playing computer games, but ____ of them made it.
