We may find that learning a foreign language does not have to be________learning our mother tongue，but can in fact be twice ________.

Scientists have come to the conclusion_______ the temperature on Earth is getting higher and higher.

The H1N1 flu spread very quickly at the beginning, __________, many people were ill.

Although Linda tried hard in the exam, she did ______ than her brother. 

I am not sure exactly how much money you will receive, but it will______cover your major expense.