a person who is not known or mentioned by name

occasionally rather than all of the time

the particular way in which something is done

the day of the week after Friday and before Sunday

to talk to somebody about something; to have a conversation with somebody

the fact that you have achieved something that you want and have been trying to do or get

knowledge about the structure and behaviour of the natural and physical world, based on facts that you can prove, for example by experiments

two slices of bread, often spread with butter, with a layer of meat, cheese, etc. between them

number 70

a sweet substance, often in the form of white or brown crystals, made from the juices of various plants, used in cooking or to make tea, coffee, etc. sweeter

a set of words expressing a statement, a question or an order, usually containing a subject and a verb.

a person who studies or is an expert in one or more of the natural sciences (= for example, physics, chemistry or biology)

something that you can hear