We mustn’t waste anything; ______, we mustn’t waste our time.
A. after all B. in all C. above all D. at all
A lesson from the terrible drought(干旱) that hit some parts of southwestern China this year is that more anti-drought projects ______ built in the past years.
A. should be B. should not have been
C. ought to have been D. must be
—Where did you get this book?
—Oh, I ______ it in the bookshop when I was looking for another one.
A. came across B. found out C. looked for D. came up
The plane of the Polish president was about to land ______ it snagged(挂) treetops and crashed, ______ the president and 96 others on board.
A. while, killed B. when, killing
C. and, and killed D. when, to kill
Mum ______ to us. “Be quiet! Your little sister is sleeping.”
A. shouted B. explained C. whispered D. replied
全球变暖是我们都关注的话题，我们每个人都应该对自己每天的生活和选择所产生的温室气体负责。因此，防止气候变化需要地球上的每个人共同来努力。写一篇100字左右短文介绍如何减少碳排放量。开头已给出。
1. 采用喷头淋浴而非浴缸。
2. 不使用时，关掉所有电器，如灯等。
3. 买适量的食物，合理处理剩饭。使用自己的饭盒，不用一次性饭盒。
4. 使用可再用的购物袋。
Words: 温室气体: greenhouse gases 碳排放量: carbon emission
一次性饭盒: disposable container 饭盒: lunch box 剩饭: leftover food
Global warming catches and holds our concern. _____________________________________
