Object

• inequality: Can vouchers be fair, or do they exacerbate existing inequalities?

• imbalance: The last thing we should be doing is using billions to exacerbate that imbalance.

• asthma: Ozone - An irritant to the throat eyes and lungs, which will exacerbate asthma, allergy and bronchial conditions.

• shortage: They also believe these policies " prevent willing and healthy members of the community from giving blood and exacerbate the current blood shortage.

Present participle complement

• exist: Cannabis use may also exacerbate existing mental health problems.

Subject

• lack: The venue has some added problems all of which are exacerbated by lack of space.

• shortage: This has been exacerbated by staff shortages through illnesses in all hospitals.

• absence: The problem had been exacerbated by the absence of global norms for reducing the accumulation, transfer and trafficking.

• stress: Meanwhile, Suzi's illness still flares up, exacerbated by stress ( being married to a goalie can't help much ).

Present participle complement

• pre-exist: Poor conditions and overcrowding in Russian prisons have exacerbated pre-existing weaknesses in prison health services to create high levels of infection among prisoners.

Preposition: by

• lack: The venue has some added problems all of which are exacerbated by lack of space.

• shortage: This has been exacerbated by staff shortages through illnesses in all hospitals.

• absence: The problem had been exacerbated by the absence of global norms for reducing the accumulation, transfer and trafficking.

• stress: Meanwhile, Suzi's illness still flares up, exacerbated by stress ( being married to a goalie can't help much ).