10,000 dollars is a lot of money，but it is still ______than we need for a new school.

As he works in a remote area, he visits his parents only__________.

 With more and more farmers moving to cities, an inadequate labor force is    becoming a major factor affecting the country's grain output.

_____, the fire was discovered soon after it broke out , otherwise it might cause much greater damage．

We don’t have enough money .We,_______, can’t afford to buy the car.