现在进行时基本用法 — 英语词汇题
题目
根据首字母和中文提示，用动词的适当形式补全句子，每空一词：
1. Look! The students are p_______ (准备) for the Spring Festival party in the hall.
2. Be quiet! My little sister is s_______ (睡觉) now.
3. Listen! Someone is k_______ (敲) at the door.
4. — Where is Daniel? — He is w_______ (观看) the fireworks outside.