noun - a box where letters etc. are put in order to be sent by post

adjective - not difficult, of low difficulty, able to be done without much effort or trouble

noun - an old popular story about brave people etc., it doesn't have to be true

noun - a piece of paper that is supposed to be filled in with certain information

noun - a warning that somebody should do something if they don't want to be harmed

noun - the ability not to be affected by something, protection against the effects of something

phrase - used to say that the most important things should be done before anything else

verb, informal - to disappear without telling people where you're going, how long you'll be gone etc.

adjective - that can be easily agreed on

adjective - cannot be changed or improved, final

adjective - that can be noticed or seen

noun - clothes that should be washed carefully

noun - an agreement that mustn't be broken

adjective - that must be done; not voluntary

noun - great happiness that can be seen