【推荐1】Nowadays, students are required not only to know the answer, but also to be able to e________ the reason behind it.

【推荐2】This problem was ________ (解释) by him just now, but most of us still can’t understand it.

【推荐3】根据句意，用括号中所给单词的正确形式填空。（每空一词）
1. No doctors gave up __________ (operate) on the old man.
2. After studying seven years in the _________ (medicine) college， he became a doctor.
3. If everyone _________(obey) the traffic rules， there will be fewer accidents.
4. Would you mind ________ (explain) the sentence again? I can't hear you clearly.
5. I don’t know what made him laugh so ___________(excite).
6. We can have a three days’ break， __________(include) the weekend.
7. Simon lives in a big family. He doesn’t know all his ___________ (relative) names.
8. Because of colour _________(blind)， Tom can’t join the army to be a soldier.

【推荐1】Jack seems busier than you ________ (get) ready for the exam.

【推荐2】Look! The students are busy ______(prepare) for the coming exams.