China made a commitment to the world in the Copenhagen Summit that by 2020, the carbon-intensity of its economy ______ fall 40% to 45%.
More and more people choose to shop in the supermarket,for they are especially interested in the ________ of goods on offer.
Do you think that prices of vegetables will ________?
Though the girl ________ to learn Japanese,she couldn’t catch up with her classmates.
Always acting in a strange manner,Einstein must have ________ to people around to be mad.
Dark glasses are sometimes worn to ________ the eyes from strong sunlight.