Do you hear it?Someone______(ring) the doorbell.Jenifer often spends lots of time_____(stay) with her grandmother.They came to see me while_____(prepare) for my test yesterday morning.

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Do you hear it?Someone______(ring) the doorbell.
Jenifer often spends lots of time_____(stay) with her grandmother.
They came to see me while_____(prepare) for my test yesterday morning.

依次填写:
is ringing
staying
preparing