Radar enables the pilot of an airliner to take off, fly and land in _____.
| A．danger | B．comfort | C．continuity | D．safety |
. She thought it __ great experience as she enjoyed the beauty of ___ nature.
| A．a; / | B．a; the | C．the; / | D．the; a |
What ___ of blood does Jack have?
| A．sort | B．type | C．category | D．kind |
. Deer____ mainly on grass.
| A．live | B．lives | C．feed | D．feeds |
. Why didn’t you come? Haven’t you __________?
| A．allowed | B．promised | C．invited | D．agreed |
This dictionary is _____ to my reading, but that one is __________.
| A．great help; helpless | B．a great help; of no use |
| C．important; of few importance | D．very helpful; of no any use |