1 . The teacher, along with a lot of students, ________ (prepare) desserts at present. （所给词的适当形式填空）

2 . Many companies, including Uber, ________ (compete) fiercely in this space now. (所给词的适当形式填空)

3 . 尽管克隆人类胚胎在很多国家不合法，但一些科学家正在努力推进研究，以制造出克隆的人类婴儿。
While cloning human embryos is not legal in many countries, some scientists are already __________ __________ _________ the research in order to produce a cloned human baby.

4 . -With American tech companies cutting ties with China's Huaiwei, US___________ the global economic recovery now.
-I can’t agree more. I believe more damage is on the way.

A．is damaging

B．has damaged

C．damaged

D．had damaged