.It is difficult for any of us to eat better, exercise more, and sleep enough,________ we know we should.
When a student asks__________it is worth staying up doing their lessons, a teacher may find it difficult to answer.
Mr. Li arrived at the Wuguang train station twenty minutes ago, but the train to Guangzhou_______yet.
To pass the driving test, Alice had a busy month driving the car.
How can they expect to learn anything_________they never listen?
Only when______senior high school_________to show a great interest in poems.