英语高手请进.....请高手帮我做下面的题目:二、多选题（共 2 道试题，共 4 分。） 1. This is the

英语高手请进.....
请高手帮我做下面的题目:
二、多选题（共 2 道试题，共 4 分。）
1. This is the first thing ______ we should do.
A. that
B. /
C. which
D. what
满分：2 分
2. He is the last person ______ we should believe.
A. /
B. that
C. whom
D. which
满分：2 分
三、判断题（共 6 道试题，共 30 分。）
1. Seeing her best friend get off the train, Irene (observed) quickly down the sidewalk to give her a hug.
A. 错误
B. 正确
满分：5 分
2. After being put in the sun and watered regularly, the once-sickly plant soon (thrived).
A. 错误
B. 正确
满分：5 分
3. The teacher wanted to (overwhelm) his new students, so he gave them just a little homework at first.
A. 错误
B. 正确
满分：5 分
4. Even though the police believe that Frank robbed the liquor store, they don’t yet have (sufficient) evidence to arrest him.
A. 错误
B. 正确
满分：5 分
5. Dan is worried about his math test because he knows it is (crucial) to his grade for the course.
A. 错误
B. 正确
满分：5 分
6. It is impossible to cut the steak with these plastic forks and knives—they are so (flexible) that they snap into pieces as soon as you press hard on them.
A. 错误
B. 正确
满分：5 分
请直接回复题号加答案就行,谢谢您的帮助!!!!