单项选择
1. When the Smiths came back home from London, they found their house ______and many valuable things stolen.
A. broken down B. broken off C. broken into D. broken through
2．The university I applied to asked me to provide all the information ______my academic achievements.
A. relating to B. is related to C. relate to D. relate with
3. You should understand the traffic rule by now. You've had it_______ often enough.
A. explaining B. to explain C. explain D. explained
4．Before building a house, you will have to _________ the government’s permission.
