单选题 《复合题被拆开情况》 The best birthday I’ve ever had was my 21st. My family told me they were going to【C1】________ me out to dinner, but in fact they planned a surprise party【C2】________me. As I opened the door to leave the house,【C3】________were about 30 friends standing outside. They all sang "Happy Birthday" and【C4】________we went back inside. I【C5】________lots of cards and then, a small present. I【C6】________it to find some car keys—my parents had bought【C7】________a car! My mother brought out a cake with 21 candles(蜡烛) on. I was【C8】________happy that I almost couldn’t blow【C9】________out! I managed to make a short speech (讲话), thanking everyone for【C10】________, and we partied into the late night.《问题》：【C9】