一、单句填空
1．—Can't you stay a little longer?
—It's getting late.I really________go now. My daughter is home alone.
答案：must句意为：——你不能再呆一会儿吗？——天色晚了。我真的必须得走了。我女儿一个人在家。根据语境中“天晚了”和“女儿一个人在家”可知，这里表示必须得走了。must意为“必须”。
2．—I'm afraid I have to leave now, for you see, he is waiting for me.
—Well, if you ________， at least wait till the heavy rain stops.
