The temperature is high enough ________water into vapor(蒸汽).
--How long ___________ each other before they__________ married?--For about a year.
It is a rule in his family that __________ comes home earlier should cook the dinner for the family.
The black horse is___________ of the pair.
I coutdn't have got to the meeting on time____________ an earlier train.
Take a taxi,___________ you'll miss your train.