Mary speaks in a low voice; ____ is difficult to know what she is saying.
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.
________ is quite natural,a beginner can't read the books written in English very quickly.