—Look!How long________like this?—Three weeks! It's usual here that rain________without stopping these days of the year.
I don’t know who invented ________ telephone. It’s really ________ most useful invention.
----Whose advice do you think I should take? ----________.
I know a little bit about the city as I __________ there for one year in my youth.
Leaves are found _______ all kinds of trees, but they differ greatly ________ size and shape.
To save class time, our teacher has ________ students do half of the exercises in class and complete the other half for our homework.