Ⅰ.单句语法填空
1. We arrived at work in the morning and found that, some body________(break) into the office during the night.
2．__________ you get into a bad habit，you'll find it hard to get rid of.
3．Graduation is a term often__________(connect) with high school or college.
4．We would encourage him to try again__________he failed this time.
