1 . Because of climate change, the ice that polar bears depend on for survival ____ (disappear) slowly. (所给词的适当形式填空)

2 . The remarkable development of this city, which is consciously designed to protect the past while _______ (step) into the modern world, means there is always something new to discover here, and I could be photographing Beijing for the next 50 years. (所给词的适当形式填空)

3 . At present, the remarkable development of digital economy________ (transform) our modern way of life.(所给词的适当形式填空)

4 . Professor Smith, as well as his assistants ________ (do) an experiment in the lab now.

5 . They are ________ (negotiate) a deal in the office, but neither is willing to make a compromise. (所给词的适当形式填空)

7 . The police________ (investigate) the accident right now. (所给词的适当形式填空)

8 . I am ________ (freeze) to death; I shall become a lump of ice! (所给词的适当形式填空)

9 . They are ______ (appeal) to the public for donation for the earthquake-hit areas. (所给词的适当形式填空)

10 . Many a student ______(flood) into the dining hall now, tired and hungry. (所给词的适当形式填空)