【推荐1】_________ (曾经) Joan and I were good friends. I often went to her for help ____________(随时) because she would always solve the problems ________ (及时). Joan was clever，and ________(同时) she liked to finish her homework _________(提前) and she liked to do it _________(一次)．(根据汉语提示完成句子)

【推荐3】________ (遗憾的是), I’ll have to meet my friend at the airport. （根据汉语提示完成句子）

【推荐1】他们前天买的是三本书。（be）
It ________ three books that they bought the day before yesterday.

【推荐2】因为被堵， 他上班迟到了。
He was late for work because ________________________.

【推荐3】他们都参加了这次比赛。
They all ______ ______ ______ the competition.