If a computer crashes,you will lose the file you _____ on if you don’t save it early enough.
The video,Gangnam Style,is becoming the first video________ more than one billion views.
The problem is so complex that I'm afraid it will take me several hours to________.
The newlylearnt words will be impressed on us only if they are ________used in everyday communication.
The car's________ has improved a lot since a new engine has been applied to it.
How________ you expect to get something in return when you never willingly lend a hand to others?