1. Listen carefully to each pair of sound below.
cất (to put sthg. away) cắt (to cut)
chân (leg) chăn (blanket)
cầm (to hold in one's hand) cằm (chin)
dậm (to stomp) dặm (mile; road)
bấc (rush: grasslike plants) bắc (north)

2. Listen again and repeat.

3. Listen to the sounds on the left, then match the correct vowel on the right with each sound.