七嘴八舌: lively discussion with everybody talking at once...
支付: to pay (money)...
费用: cost, expenditure, expense...
防: to protect, to defend, to guard against, to prevent...
改: to change, to alter, to transform, to correct...
送礼: to give a present...
温习: to review (a lesson etc)...
外交官: diplomat...
不亦乐乎: isn't that a joy (quote from Confucius), (jocularly) extremely, awfully...
克: gram, overcome...
