【推荐1】Nanjing has changed a lot. And it is _______ beautiful than before. Even though（即使）there are a lot of people and cars, the city is great! I love her!

But as the city changes and develops, people don’t change _______. There are a lot of litter bugs（乱扔垃圾者）. They _______ their rubbish everywhere. _______ don’t they just find a rubbish bin? They just don’t _______ to think about how beautiful our city has become and how they can help to keep it that way. _______ maybe they just don’t care.

If you want to turn a beautiful place _______ something ugly, _______ cover it with rubbish. A(n) _______ tree-lined street can look like a garbage dump（垃圾场）at once!

I do have some ________ for us students. Next time you are about to throw something, stop and think about how beautiful your city is. Then find a rubbish bin and do as your favourite basketball player does-dunk（扣篮）the rubbish into the basket and score 2 points for the environment!

【推荐2】For billions of years, life on our planet has evolved to the natural rhythms of night and day caused by the rotation of the earth. For humans, the sun gives us essential vitamins and the light we need to function. When the sun goes _______ and darkness sets in, the melatonin (褪黑素) in our brains make us _______. Around us, other creatures awaken and use the darkness to hide or to hunt, to travel, and to communicate. Twinkling lighting bugs flash in the dark to communicate. Prey uses the shadows to hide and predators use the shielding darkness to hunt. _______, over the last hundred years or so, our night sky has been fighting a losing battle against humans’ artificial light.

Migrating birds _______ buildings, and newly hatched sea turtles mistake the glow of streets for the shimmer of the moon on the ocean. We even face more direct _______ risks from artificial light. Artificial light emitted from our screens, lamps, and streetlights _______our normal sleep rhythms and decrease our melatonin production, which can cause adverse effects to our health.

The _______ use of artificial light at night can have unintended effects on amphibians, birds, mammals, insects, plants, and even our own bodies natural cycles. _______, the solution could be as easy as flipping a switch. The IDA (International Dark-Sky Association) has found ways that each one of us can help _______ light pollution and fight for the night. Solving this issue could be as easy as being sure to shut off all ________ lights at night, or investing in quality outdoor lighting that shines towards the ground.