现在进行时的构成与用法 — 英语词汇题
题目
根据中文提示，写出下列动词的现在分词形式，并补全句子（每空一词）。
1. My sister is d________（画）a picture in her room.
2. Look! The boys are s________（唱歌）in the classroom.
3. I am w________（写）a letter to my friend.
4. Grandpa is r________（读）a newspaper under the tree.