Johan didn’t review(复习) the lesson, ___ he couldn’t answer the teacher’s question.
The trees are best friends. They give us a large number of things that we need.
Kevin was _____ 8-year-old boy. His parents decided to send her to _____ boarding school.
If you work hard, you will have a ________to enter a good university.
—Would you mind helping me look after my baby for a while?— ____________
—What else should we pay attention to ________ building the bridge?—The change of the weather, I think.