Will you take D5581 or G7619 to Hangzhou? — G7619. I will have to more money, but it will much less time.

____ do you have a talk with your teacher, Tom?—Once a week. [ ]

I think the older people must be _______ politely. —Yes. You are so kind.

Do you know a spaceship flies at about nineteen kilometers ________ second?

The research project has only been______for three months, so it’s too early to comment on its success.