---I was wondering if we could go skiing on the weekend.---     good.

Only when _______ 30 years old ______ to learn English.

When first ________ to the market, the computer software ． was not a success due to its complexity in operation. 

After a 5-year absence, we returned to our mother school, and not until then       it was such a beautiful school. 

 —Mary said Leo worked really hard.  — _______.

 —We could invite John and Barbara to the Friday night party. —Yes,  ______ ? I’ll give them a call right now.

_______ let fake products become uncontrolled in the market.

 Not until ___ on TV ___ that the Chinese was rescued by the European Union Task Force.

_____________ late, but also he forgot his books.

The experiment shows that proper amounts of exercise, if      regularly,  can improve our health.   

Only when one leaves his homeland ______ how much he loves his motherland.

These problems, __________, will seriously affect the growth of teenagers and even the nation’s future.    

Only when he got on the train _________ that he had left his mobile phone at home．

I was told that _________ somebody to meet me at the station but _________ anybody.

While ____ the dog, you should take care not to get loose . Otherwise, it may be dangerous to strangers.

—My sister took a photo with Jay Chou last year.—______.

Only by practising constantly__________ greater progress. 

________ entered the classroom _________ the bell rang.

Doctor have said that as many as 50% of patients don’t take medicine _______.

Only when I made it to the train station _______ that I had left my ticket at home.