WHEN YOU SEE YOUR TEACHER APPROACHING YOU, A SLIGHT WAVE TO ATTRACT...

1. - KIEM TRA 1 TIET LAN 1
KIEM TRA 1 TIET LAN 1

1.

When you see your teacher approaching you, a slight wave to attract his attention is appropriate.

a. coming nearer to b. catching sight of c. pointing at d. looking up to