It's not easy to change habits, ______ with strong will and self-control, it is possible.
句意：改变习惯并不容易，但只要有坚强的意志和自制力，这是可能的。
考查连词辨析。for为了，因为；or或者；否则；but但是，表示转折；so因此，所以。根据句意可知，空前说“It’s not easy…”，而空后说“it is possible”，前后为转折关系，应用but连接。故选C。
It's not easy to change habits, ______ with strong will and self-control, it is possible.
She says that she'll have to close the restaurant ______ business improves.
The boy is not very tall, _______ he runs very fast.
You will feel cold _______ you don't wear a coat.
In some cities of China, you'll get fined ________ you don't walk along the crosswalk while crossing the road.
Vivian will take her daughter to the amusement park________she gets the tickets．
Which club do you prefer to join，the chess club________the dancing club？
Love from parents is like the wind-you can’t see it you can feel it.
My parents gave red packets to my cousin every Spring Festival________ she got a job, because she said she was able to make money.
They didn’t go home ________ they finished their work.
