Proszę o pomoc

Wybierz poprawne uzupełnienie zdań.

We __ our English class on Monday.
A ‘ve
B have
C are having

2 While I __ the road I saw my best friend.
A crossed
B had crossed
C was crossing

3 How long __ here?
A are you
B have you been
C did you

4 If you don’t water flowers, they __.
A die
B are dying
C would die

5 These trees __ planted before World War II.
A have been
B will be
C were