Coul anyone look at some of the answers?

Hello everyone,

I hope this is the right section of the forum for these kind of questions. If not, feel free to move/delete.

I was taking a multiple choice test, but I couldn't find the answers.

Could any of you enlighten me on some of the questions I have doubts on?

Thanks in advance, and sorry for the overly long post.

1)I wonder ... . It certainly isn't mine.

a) myself whose umbrella this is

b) whose this umbrella is of

c) to whom belongs this umbrella

d) whose umbrella this is (I chose this one, had to decide between this and a) )

2)... that it was so serious, she would certainly have called the doctor sooner.

a) Had his mother known (I chose this)

b) If his mother would know

c) His mother knowing

d) If his mother was knowing

3)Over the pas then years air travel in Europe has become much ... .

a)convenient

b)economic

c)cheaper (I chose this one)

d)low cost

4)We have to choose ... a house or buy an apartament

a) if to rent (I chose this, had major doubts between this and b) )

b) between whether to rent

c) if we may rent

d) between renting

5) Earthquakes sometimes seem to come so soon

a) the one after other

b) after one other

c) one another

d) one after another (chose this one, but maybe a) was the better option?).

6) The train ... .

a) had two hours of delay.

b) had two hour's delay

c)was two hours late (I chose this, but I don't see anything wrong with a) either).

d) was late of two hours

7) ... public opinion in Britain is still quite divided

a) For what regards the European monetary union

b) As far as the European Union is concerned (I chose this one.)

c)For what is concerning the European monetary union

d) As for what concerns the European monetary union