1. stray v. 走失
Pound the cows so they don't stray.
2. substantial a. 可观的，大量的=considerable
a substantial income 一大笔收入
Substantial profits accrue when sales take off.
3. sufficient a. 充分的
We must work hard, but equally we must get sufficient rest.
4. supplement v./n. 补充
He supplemented his income by taking apart-time job.
5. swing v. 摇摆
The children were swinging on a rope.
6. scope n. 范围
This subject is outside the scope of our inquiry.
7. seemingly ad. 表面上
Any seemingly viable proposition will be tested by market research.
8. speculate v. 猜测
The doctors speculate that he died of cancer.
9. steep a. 陡的
This hill is too steep to ride up on a bicycle.
10. summon v. 唤起
How can I summon up his courage?