I _____ you somewhere before , but your name has escaped me _____ moment .
| A．must see ; for a moment | B．must have seen ; for a moment |
| C．must see ; for the moment | D．must have seen ; for the moment |
______ more energy to my study instead of being addicted to Internet games, I would be sitting in a comfortable office now.
| A．If I devoted | B．Had I devoted |
| C．Should I devote | D．If I were to devote |
The water of the Miyun Reservoir is regularly ______ to ensure the security of Beijing people’s drinking water.
| A．tested | B．checked |
| C．examined | D．inspected |
It wasn’t until he was diagnosed with cancer ______ he realized the significance of health.
| A．when | B．that | C．which | D．what |
The sign over there says that no person ______ enter the area without official permission.
| A．may | B．must | C．will | D．shall |
Ten years ago the population of our village was ______ that of theirs.
| A．as twice large as | B．twice as large as |
| C．twice as much as | D．as twice much as |