Tenses 时态

从下面选项中选择正确答案；单击“核对答案”按钮，核对你的答案.

1 :  I __________ to Berlin a few years ago.

2 :  He __________ Spain before he went to study at university in Barcelona. There  were a lot of cultural differences to get used to.

3 :  So far, I __________ all of my girlfriend's friends but not her parents. I  wonder why.

4 :  For the past year, I __________ a flat with other people and trying to save  money to open my own business.

5 :  We don't feel safe in our town at night because it __________ so dangerous.  There's a mugging or robbery every week now.

6 :  If I __________ enough for a deposit for a house, my parents will help me get  a mortgage.