China made a commitment to the world in the Copenhagen Summit that by 2020, the carbon-intensity of its economy ______ fall 40% to 45%.
The road becomes so crowded during rush hours, ______ it becomes a very slow route.
-- The classroom looks like a mess! -- Yes, but who left the waste paper ______ around?
-- I think we'll give Bob a ring. -- We ______ . We have been out of touch with him for ages.
Honey, stay outside and ______ a few minutes; then we'll go to church together.
-- Why didn't you go camping with us? -- But I ______ all about it!