The work is not very profitable(盈利的) _______ cash(现金), but I am getting valuable experience from it

He made up his mind to devote his life_______ pollution_______ happily.

Lucy and Lily are twins, but they are different _____each other in many ways.

What time do you expect me back, Mum? — Say, ______half an hour.

Most of the local restaurants were fully booked more than a month ________[ ]