Aa big headache～aware of

Bb back and forth～by way of

Cc Ccall back～cut up

Dd Dday after day～dwell on

Ee Eeach other～expert at/in/on

Ff face to face～from time to time

Gg get about/around～grow up

Hh hand down～hurry up

Ii if not～intent on

Jj judging by/from～just so

Kk keen on～kill time

Ll last but not least～lots of

Mm mad about/on～my treat

Nn name after～now that

Oo off and on～over and over （again）

Pp particular about～put up with

Qq quite a few/a lot

Rr rain cats and dogs～rush hour

Ss save one’s breath～sure of/about

Tt take a leave～typical of

Uu uncertain of/about～used to

Vv vital to～void of

Ww wait for～would rather

Zz ziP code～zip（sb./sth.）up