tom is a fast runner, but he swims ( ).
a. slowly b. slow c. busily d. busy

we first met 20 years ago, and we are ( ) good friends.
a. yet b. still c. already d. lately

he was angry because i wasn’t ready.
but he arrived too ( ).
a. late b. frequently c. early d. often

i don’t know who justin is.
i’ve naver met him ( ).
a. yet b. still c. before d. ago