He has worked __________ the maths problem for nearly an hour but he simply can't work it __________.
He failed to ______ himself to the new environment.
—What do the letters “DOS” ______? —Disk Operating System.
_____ is believed that the betterknown companies spend about 70 per cent of the total cost of the product itself on packaging!
The brave solider was willing to risk ______ his life rather than ______ himself up to the enemy.
If he did not know them,he would greet them with a few words about weather,but if he did,he would ask about their families or make jokes,always cutting his cloth ______his customers.