______ can do a job patiently and attentively for many years unless he loves it.
The old farmer has two daughters, _______ is kind to him, _______makes him very sad.
When we worked in the same office,we _______ often have coffee together.
It was when she was sleeping in her bedroom __________ a thief broke into the house.
________ take the aeroplane all the way, they decided to fly to Vancouver and then take the train from west to east across Canada.
It’s heavy, but I can ________ to carry it upstairs.