If I were you, I would take it easy; ________ is no need to be nervous [ ]

___ a very rough sea, with waves ten metres high

Waves of red light are about twice as long as _______ of blue light.

Is it good to look up every new word when I come across it in reading? — No. You , because you are likely to guess the meaning from the context.[ ]

You have to reorganize your article to make it _______.