He is going to be a teacher when he_____up.
This accident (事故) happened (发生) ________ a winter afternoon.
单词辨音
—I am going to Sanya for my holiday tomorrow.—_____________.
— Look! The girl ______ long hair is making a snowman. Is she Sandy?— It _______ be her. I’m not sure.
The Maths problem is so difficult that _______ students can work it out.