Why did you collect your CD?—-That day I didn’t see your car, so I _____you’d gone out.

There so many foreigners in the streets these days.– They might be runners in the Yellow River Estuary (入海口，河口) International Marathon.

The cattle _______ grazing on the grass.

Do you like playing computer games—No, but I ______ .

The house _______ Lu Xun used to live in is now the museum.