Without proper lessons, you could ____ a lot of bad habits when playing the piano.

disaster occurs, all people, ________ they are old or young, rich orpoor, try their best to help those in need

Why don’t we choose that road to savetime —The bridge to it __________.

How can you step into the lab with your shoes on? You’re _____ to take them off before you enter itI told you so! [ ]

Writing stories and articles _____what Ienjoy most，