Have you ever been to Shanghai?－Yes. I ______ there with my father last year.
____ is it from Shanghai to Shijiazhuang?— Two thousand kilometers. [ ]
I could look after ___ when I was six.
Mom, I like green T-shirt. Could you buy it for me?
Another drug that has helped improve people’s health is penicillin, _________ is _________ by many _________ one of the most important medicines.