How much did you _____for the pen—Five yuan.It’s a bit expensive.

It’s nice. Never before_______ such a special drink!

When People’s Bank of China announced that we should stop the use of bitcoin(比特币),there was fear among those who had had their Chinese Yuan _______ for bitcoin.

He showed the visitors ________the library .

Miss Li has taught ____ English for about 3 years. —You are lucky. ____ is a very good teacher.