What did you do _______ the weekend? [ ]

They have stayed in Beijing for ________________.

─ Look, Stella is there!─ That ______ be her. She doesn’t like singing.

What a hardworking doctor! He _________ has time to play with his son.– That’s true. Even on Sundays he is busy with his work.

What’s this in the photo?—It’sUFO.I took the photo.