1.   A test is useful for discriminating those students who have reached a higher level from those at a lower level.

2.   But do not try to wake him into a higher level.

3.   But once Ollie had started to mature socially, his male hormone output enhanced his urge to gain a higher social level.

4.   But routine screening of milk for contaminants should have disclosed higher lead levels by mid-October.

5.   Cooperative claims Production System provides a higher level of security by giving every user a different profile.

6.   Economists consider some job losses inevitable, even healthy, because automation leads to higher levels of productivity.

7.   However, with experience of rather higher levels of use an asphalt surface has now been added to reduce annual maintenance costs.