_________ I will visit Brazil during the 2016 Olympic Games.

It will be another 50 years ______ our country is expected to reach the level of a medium developed country

There were many causes for his failure, but ________, it was because his carelessness and little preparation.

Where is Jack —I noticed that he ________the teacher’soffice just now.

How much ____ the elephant ____ —Perhaps the ____ of it is 2 tons.