_______caused the accident is still a completemystery.

On foggy days, you have to drive very ________ on the expressway to avoid traffic accidents

We are sure the_________Olympic Games in Beijing next year will beone of_________games in history.

The news that No.1 Middle School of Qujing was again estimated (评估) the first of the first prize in 2008 _____.

What do you think of a monkey —______