单项选择题
"Alice, why didn’ t you come yesterday I tried to look for you. " "I______, but I had an unexpected visitor. "
单项选择题 Yesterday morning she______an old friend on her way to the subway station.
单项选择题 "Which do you want, the red one or the black one" "______. How about showing me another one"
单项选择题 They decided to chase the cow away______it did more damage.
