These MP4s are more advanced, but they are ________ the previous ones in price.

She was about to go to bed when it suddenly _____ to her that she hadn’t turned off the gas.

The meeting was to_________ but the manager________ until twenty minutes later.

The experiment __      to be          .

It is said that Karaoke was invented in 1971 and then it ________ to the whole world.

Over the years the European Union has made great efforts to _______ the safety of food and protect the health of its people.

Be careful with the paper for it ____________.

I tried to call up my relatives in Kyrgyzstan where an unrest(动乱) was going on, but couldn’t _________.

The seller would sell the coat for five dollars, but the customer ______ four dollars．

Full use should be _______the natural resources to combat the energy crisis.