1. You will want two trees about ten feet apart， from ________ to suspend your tent.

A) there B) them C) which D) where

2. As I was just getting familiar with this job， I had ________ to ask my boss.

A) many B) most C) more D) much

3. ________ quite recently， most mothers in Britain did not take paid work outside the home.

A) Before B) Until C) From D) Since

4. The survival of civilization as we know it is ________ threat.

A) within B) under C) towards D) upon

5. Scientists say it may be five or ten years ________ it is possible to test this medicine on human patients.

A) since B) before C) after D) when

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