Two-letter Trouble

The real key to winning Scrabble is knowing those two-letter words that can save you in a pinch. While some of them are obvious (go, my, an) others just sound like nonsense. Of the 20 two-letter combinations in this quiz, can you identify the ones that are recognized in Merriam-Webster official Scrabble dictionary?

1 of 20
Li
In the dictionary
No good
2 of 20
Ou
In the dictionary
No good
3 of 20
Vo
In the dictionary
No good
4 of 20
Fa
In the dictionary
No good
5 of 20
Eg
In the dictionary
No good
6 of 20
Ix
In the dictionary
No good
7 of 20
Mo
In the dictionary
No good
8 of 20
De
In the dictionary
No good
9 of 20
Ib
In the dictionary
No good
10 of 20
Ay
In the dictionary
No good
11 of 20
Un
In the dictionary
No good
12 of 20
Ew
In the dictionary
No good
13 of 20
Ur
In the dictionary
No good
14 of 20
Ka
In the dictionary
No good
15 of 20
Ao
In the dictionary
No good
16 of 20
Ye
In the dictionary
No good
17 of 20
Co
In the dictionary
No good
18 of 20
Pe
In the dictionary
No good
19 of 20
Ge
In the dictionary
No good
20 of 20
Vu
In the dictionary
No good