1. CONGRUENCE:DIFFERENCE:

a. walk:stroll
b. build:destroy
c. talk:speak
d. eat:consume

2. CONCOCTION:INGREDIENT

a. oil:water
b. car:boat
c. molecule:atom
d. soup:sandwich

3. CONCURRENT:SIMULTANEOUS

a. shut:closed
b. pretty:talented
c. easy:difficult
d. fast:slow

1.B
2.C
3.A