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

Maybe if I_____ science, and not literature then, I would be able to give you more  help. 

I definitely appreciate ____ when I can walk away from my computer after a long day of typing and have pain-free arms!

It is _____ he often fails in exams ________ makes his parents worried about him.

Never before______ such a wonderful park, ______ I'd like to pay a visit again.

No sooner______ themselves in their seats in the hall than the speaker began his speech.

…Was it in the park ______ you met Tom yesterday?
… Yes..

Not only ______, but Hunan TV’s reality show, Dad, Where Are We Going, also has made the stars and their lovely kids more popular.

---It rained cats and dogs this morning. I’m glad we took an umbrella.
---Yeah, we would have got wet all over if we ______.

It^'s said that the power plant is now             large as what it was.