几道英语!1.星期日我常独自一人在家,因为父母都去上班了!I often stay at home ＿ on Sunda

几道英语!
1.星期日我常独自一人在家,因为父母都去上班了!
I often stay at home ＿ on Sunday because my parents both ＿ ＿ work.
2.你出生在6月吗?
＿ you born in ＿.
3.＿ you born in Beijing?
Yes,I was.
A:Are
B:Was
C:Were
D:Do
4.We muststop to look around ＿ crossing the road.
That's right.Safety(安全) is the first!
A:until
B:after
C:before
D:when