2. 在困难面前, 我们应该从不放弃。
We should never__________ __________in the__________ __________difficulties.
3. 汤姆每天总是第一个来, 最后一个走。
Tom is always the first__________ __________, and the last__________ __________everyday.
4. 鱼用鳃吸氧气。
Fish__________ __________oxygen through their gills.
5. 大多数婴儿出生时的体重在6磅到8磅之间。
__________ __________, most babies weigh between 6 and 8 pounds.
答案: 1. one hundred times 2. give up; face of
3. to come; to leave 4. take in 5. At birth
