_____ you can understand how the human body woks, you need to have some knowledge of chemistry
I will visit you tomorrow________I’m too busy. A.unless B.if C.because
You’ll find________easy to learn it well.
—________do you learn English? —By________vocabulary lists.
—I can’t fall asleep. —You get up and do something________lying in bed.
If you want to pass the exam,you should try to make________possible.