1 . She has written a survey report ________ (regard) the harms of using mobile phones.(所给词的适当形式填空)

2 . The government has set up some rules ________(关于) the food safety. (根据汉语提示单词拼写）

3 . Call me if you have any problems r________________(关于) your work. (根据中英文提示填空）

4 . _________ being the first human to walk on the moon, US astronaut Neil Armstrong’s life has been mostly unknown to the public.

A．Despite

B．Regarding

C．On account of

D．On behalf of