On 5 December 2013, China Central Bank prohibited financial institutions from handling Bitcoin transactions, _____ to regulate the virtual currency.
—What do you think of teaching,Bob?—I find it fun and challenging.It is a job ________ you are doing something serious but interesting.
The weather turned out to be very good,________ was more than we could expect.
Is this the factory ________ he worked ten years ago?
Alice received an invitation from her boss,________ came as a surprise.
I have bought two ballpens,________ writes well.