【推荐1】Hello, I ________ (not know) you ________ (be) in this school. Which class are you in? (所给词的适当形式填空)

【推荐2】It is essential for us ________(know) all the facts. (所给词的适当形式填空)

【推荐3】San Francisco plans to set up free, universally available wireless access to the Internet, _____(know) as Wi-Fi. (所给词的适当形式填空)

【推荐1】______ (surround) by thick bamboo, the ancient city hadn’t been discovered until the 1960s. (所给词的适当形式填空)

【推荐2】________ (know) as rou jia mo, which translates to “meat burger” or “meat sandwich”, they consist of chopped meat inside a pita-like bun（小圆面包）, and they have been around since the Qin dynasty, from about 221 BC to 207 BC. (所给词的适当形式填空)

【推荐3】___________(dress) in red skirt, she looks charming. (所给词的适当形式填空)