Ⅰ.语法单句填空
1．All these gifts must be mailed immediately to ________(receive) in time for Christmas.
答案：be received 句意：为了(所有的礼物)能在圣诞节前被及时收到，所有的礼物必须被马上寄出。根据句意可知receive要用不定式的被动形式。
2．The meeting was concerned ________ reforms and everyone present was concerned ________ their own interests.
答案：with；for 句意：会议与改革有关，出席会议的每个人都担心自己的利益。be concerned with “与……有关”；be concerned for/about“担心，关心”。
3．How can Margot recover ________ her illness in this room when it is so dirty and dusty? It will only make her worse.
答案：from 此处表示“从疾病中恢复过来”，因此使用recover from恢复
