Scientist have many theories about how the universe into being.
came B. was coming c had come D. would come
The athletes competed ________ each other for gold medals in the Olympic Games.
| A．against | B．between |
| C．for | D．over |
--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 |