Canada is a country _____many different nationalities as well as one with foreign immigrants _____ the majority of its population.

I am certain David has told you his business troubles —– ______, it is no secret that he owes a lot of money to the bank

(2014·青岛一模)I thought the teacher would say something about our exam result but he________it

Don’t forget to put the book on the shelf,___

Jane _____ these families of chimps for many years and helped people understand how much they behave like humans