1，achangeofpace 节奏变换
Youcantdothesechemistryexperimentsalldaylong. Youcertainlyneedachangeofpace.
2, afarcryfrom 相距甚远
Thepublishedbookisfarcryfromtheearlymanuscript.
3, andhow 的确
A: Shesagooddancer.
B: andhow.
4, amatteroftime 时间问题
Itisonlyamatteroftime.
5, aphonecallaway 一个电话之远，愿意过来帮忙。
Ifyouneedmyhelp, doletmeknow. JustrememberIamaphonecallaway.
6, awhileback 不久以前
7，allalong 一直
Iknewitallalong.
8, anythingbut 绝对不
Iwasanythingbuthappyaboutgoing.
9, accountfor 解释
Howdoyouaccountforit?
10, afterall 到底
A: IvejustseentheX-raysandyourteethlookjustfine,
B: Isee. Thenthereisnothingtoworryaboutafterall.
11, allergicto 对|过敏
Ohman! Somethinginthisroomismakingmyeyesitch. Imustbeallergic
tosomething.
12, atsbsservice 愿为某人服务