follow

displace, replace, supersede, supplant

ensue

accompany, chaperone (or chaperon), escort

hunt, search (for), seek

eye, observe, watch

defer (to), submit (to), surrender (to), yield (to)

accede (to), acquiesce (to), agree (to), assent (to)

attend, hear, heed, listen (to), mark, note, notice, regard, take, watch

hike, traipse, tramp, tread, walk

ride, run

crisscross

consider, contemplate, mull, ponder, weigh

comply (with), conform (to), keep, obey, respect

attend (to), hark (to), hear, hearken (to)

mark, notice, see

behold, look, perceive, regard, see, view

gape, gawk, gaze, glare, goggle, look on, peer, rubberneck, stare

guard, wake, ward

bird-dog, monitor, study

spy

espy, glance, glimpse, peek, peep