1.In April,thousands of holidaymakers remained__abroad due to the volcanic ash cloud.
A.sticking B.stuck C to be stuck D.to have stuck.
2.There is a great deal of evidence__that music activities engage different parts of the brain.
A.indicate B.indicating C.to indicate D.to be indicating
3.The air is so good __.
A.to be breathed B.to breathe C.being breathed
4.After he became conscious,he remembered__and__on the head with a rod.
A.to attack;hit B.to be attacked;to be hit C.attacking;be hit
D.having been attacked;hit