1.   Manufacturers have expended a lot of time and effort trying to improve computer security.

2.   Users and manufacturers have expended a lot of time and effort trying to find ways to improve computer security.

3.   We expend a lot of effort every day upon quite pointless activities.

4.   Children expend a lot of energy and may need more high-energy food than adults.

5.   The leftward nodes represent situations in which the reader is required to expend a lot of effort in deriving coherence from a text.

6.   Although the Knicks closed the gap, they expended a lot of energy just to make up for their abysmal first quarter.

7.   And it expended a lot of resources, as in the Marshall Plan, to do both.

8.   A law giving buses the right of way would be useful, he said, but is not something that he would expend a lot of political capital on.

9.   But Belle expended a lot of energy erecting a shield that kept that kind of fun away.

10.   But Seattle had expended a lot of energy to get even that close.