Toggle Navigation
Games
Blog
Class PIN
Join for Free
Sign in
Toggle Navigation
Games
PIN
Join for Free
Blog
Pricing
Contact us
Help center
Sign in
Study
Listening and Speaking Units 3&4 Vocabulary
0
%
0
0
0
Back
Restart
a typical or noticeable quality
characteristic
Oops!
Okay!
breakthrough
an important discovery that helps to improve a situation or answer a problem
Oops!
Okay!
Your experience on this site will be improved by allowing cookies.
Allow cookies