When will A Bite of China Ⅱ begin tonight—-It ______for ten minutes.

Is that Miss Chen over there–It can’t be her. She ______ England for a conference.

Not until he left his home _____ to know how important the family was for him. [ ]

So many problems ________， he is having a difficult time.

It’s really a ____________topic whether to clone a human or not.