The engineers are so busy that they have no time for outdoor sports activities，________ they have the interest.
| A．wherever | B．whenever |
| C．even if | D．as if |
--Can a plane fly ________ the Atlantic Ocean?
--Yes, but it needs to go________ the clouds for hours.
| A．through; across | B．across; through |
| C．across; across | D．through; through |
The room ___________ window is open is mine.
| A．which | B．its |
| C．that | D．whose |
Don’t turn on the radio __________ your mother allows you.
| A．unless | B．because |
| C．if | D．and |
He devotes ________to ________.
| A．himself; teaching | B．himself; teach |
| C．him; teaching | D．him; teach |
Only when it is hungry ______ a human being.
| A．a lion will attack | B．a lion should attack |
| C．will a lion attack | D．should a lion attack |