What time do we have to be at the gate of the museum? — ______ the visitors begin to check in[ ]

I like music that I can dance _______.

31—Can you tell me what time the flight to Detroit leaves? —I’m sorry, but it ______

Teenagers have all kinds of dreams. _________, some students would like to go to the moon some day.

Have you telephoned your father —Yes He _____ back next year