【单选题】
Never get off the bus ____it has stopped.
【单选题】
He should get used by now ____ Chinese food.?
【单选题】
2. As time went on, he found himself ____ with the toughest job she had ever taken.
【单选题】
He came to the meeting ____ his serious illness.
【单选题】
Dave ____ into the house without ____ out by his parents.
【判断题】
域F上两个代数元的差仍是F上的代数元。
【简答题】
<img src="http://huaweicloudobs.ahjxjy.cn/579a6ffb32e3b278ddf2e5490bdc81e7.png"/>