Because of the worldwide breakout of H1N1, many countries have placed on travel to prevent the further spread of it.
An increased concentration of carbon dioxide and certain other gases in the Earth’s atmosphere ______ global warming.
New York State has passed a law requiring that all legal contracts _____ in simple, understandable English.
When we first met Eliza, she had no manners, but said ______ her head, without thinking.
Some schools, including us, will have to make ______ in agreement with the national soccer reform.
Languages across the world are becoming extinct ______ endangered mammals and four times endangered birds.