英语真烦啊！！！(帮我解决以下问题，要详解！！！）

Question

1.Tom's room is( )from mine. a.crossing b.cross c.across d.though
2.有多少外国学生在北大学习
How manyforeign studets( )( )( )in Beijing University?
3.When shall we meet
Make( )any day you like.It's all the same to me.
a.that b.it c.this d.one
4.Five years has passed( )we left school.
How times flies!
a.after b.since c.as d.as if
5.I don't know the reason ( )shedidn't agree to our plan.
a.why b.when c.who d.what

Answer 1

1.c
2.are there studing
3.choose
4.when
5.a

Answer 2

1.C,across 后常加from,如He lives across(the street) from my house.
2.How many foreign students (are now learning) in Beijing University?
3.B,语感。。。
4.B，固定搭配、、、since：自从的意思，主句完成时，从句过去时。原句：自从我们离开学校已经5年啦，时间过的真快！
5.A。意思：我不知道她为什么不同意我们的计划。
如：The reason (that) she did it is still a mystery. 或The reason why she did it is still a mystery.

Answer 3

c
are there study
b
b
a