do well to cram earplugs in their ears and 
(ROOT (S (VP (VB do) (ADVP (RB well)) (S (VP (TO to) (VP (VB cram) (NP (NNS earplugs)) (PP (IN in) (NP (PRP$ their) (NNS ears))))))) (CC and)))
(ROOT (S (VP (VB ) (ADVP (RB )) (S (VP (TO ) (VP (VB ) (NP (NNS )) (PP (IN ) (NP (PRP$ ) (NNS ))))))) (CC )))