用括号里所给单词的适当形式填空。
1. We are________（talk）about the movie now.
2. The teacher is ________（have）a class.
3. ________ your brother ________（swim）now?
4.—What ________she ________（do）?
—She is reading a book.
5. Look! This pop star ________（sing）a famous American song.
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