The fields where crops used to be grown ________ for building now

On Dec.19, 2014, Chinese President Xi Jinping attended welcome meeting to celebrate 15th year of Macao’s return to our motherland.

I would like to stay at home instead of .

t school, English is compulsory for all students, but French and Russian are _________.

__________we get onwell with a number of people，we are usually friends with only a few