On 5 December 2013, China Central Bank prohibited financial institutions from handling Bitcoin transactions, _____ to regulate the virtual currency.
Disappointed, I was about to leave ____ something occurred, which ____ my attention.
As I waited for Mike to arrive, I ____ the clock and saw that he was late.
To be frank, I’d rather you ____in the case.
--- What about inviting Mary to our party?--- You’d better not. She prefers to be ____, so far as I know.
It is not enough to have ____ for the disabled. We should learn to respect them and help them understand their valuable roles in society.