A heavy learning burden leads to unhealthy behaviors such as poor eating habits, which ___ damage the health of students.
By the time I rushed to the train station, the last train_________.
Bring an umbrella with you__________ it rains.
With our efforts, our hometown has__________a new look in recent years.
--How do you find the film?--Oh, excellent. It’s worth__________ once again.
The most important thing you must remember is that success doesn’t come ________ and that it’s the result of years of hard work.