To make the city look more beautiful, a lot of old houses along the street have been _____.
___________, I have to put it away and focus my attention on study this week.
We have made ________ a rule________ in the office.
With a lot of difficult problems _________, the newly-elected president is having a hard time.
I still remember _______ to the Tian’anmen Square and what I saw there.
More highways have been built in China,________ it much easier for people to travel from one place to another.