1 . After gaining a reputation for his success in the superman films, Christopher Reeve advocated _________ (raise) awareness for good causes. (所给词的适当形式填空)

2 . Greenhouse gas emissions __________ (release) by coal and natural gas plants when generating electricity to power those air-conditioners would nearly double, from 1.25 billion tons in 2016 to 2.28 billion tons in 2050. Those emissions would contribute to ________ (accelerate) global warming, _________ could further heighten the demand for air-conditioning. (所给词的适当形式填空)

3 . Gabi Rizea only discovered his talent for woodcarving three years ago, and put it to good use, saving dozens of old tree stumps from being removed by________ (turn) them into impressive works of art.（所给词的适当形式填空）

4 . While the younger generations prefer _______ (communicate) visually, for those used to working with traditional tools like email, it may feel like a learning curve（曲线）. (所给词的适当形式填空)

5 . Flashflood, an app that advocates buying soon-to-expiry (快到期) food at a discount rather than ________ (abandon) them, has been set to hit Canadian grocery stores. (所给词的适当形式填空）