If ignited，which material would be a class B fire?（）

The chimney vomited a cloud of smoke. A: Ignited B: immersed C: emitted D: hugged

Firefighters believed that an un-extinguished cigarette butt ____the forest fire. A: decided B: ignited C: deteriorated D: collided

The government ______ a warning that the strikers should end their action or face dismissal. A: identified B: issued C: ignited D: immitated

In an automobile engine, the vaporized fuel is mixed with air, compressed in the cylinder and by a spark. A: blazed B: flamed C: ignited D: exploded

“Doctor, your patient is on fire.” The man in question was psychiatrically unstable and had ignited himself. A: blamed B: ignored C: toasted D: set fire to

"Hotel workers suspect that the fire was ignited by a cigarette and that a guestmay have thrown the cigarette into a bush from the pool deck."The modalauxiliary verb phrase"may have thrown”in the sentence expresses______. A: high possibility in the past B: low possibility in the present C: high possibility in the present D: low possibility in the past