按要求完成下列各句。
1. I study by working with friends.（对画线部分提问）
    _____ _____ you _____ ?
2. Jack used to wear glasses．（改为否定句）
    Jack _____ _____ to wear glasses.
3. The teacher should allow members to use their dictionaries.（改为被动语态）
    Members _____ _____ _____ _____ _____ their dictionaries.
4. I will take a small present.(用if I were you作假设条件）
    If I were you, I _____ _____ a small present.
5. It must be Li Ming's.（改为同义句）
    It must _____ _____ _____ Li Ming.