Air is________and of no smell but we can feel its motion when there is a wind.
A.unavoidable | B.unavailable | C.unaccessible | D.invisible |
He was deep in thought with his eyes_____ on the ceiling.
A.fixed | B.fixing | C.fix | D.to be fixing |
The car was completely _____ and the driver seriously injured.
A.broken off | B.taken off | C.written off | D.picked up |
Although the causes of cancer_____, we do not yet have any practical way to prevent it.
A.are being uncovered | B.have been uncovering | C.are uncovering | D.have uncovered |
______run fast should take part in the 400-meter race tomorrow.
A.Anyone who | B.Those who | C.No matter who | D.Whoever |
Was it in the factory_____ you worked five years ago___ you learned the technique?
A.that; where | B.where; when | C.where; where | D.where; that |