Set phrases with prepositions

Excuse me, may I sit here?

• At ease, have a seat.

• By all means, have a seat.

Some great discoveries were made ________.

• by a long way.

• by mistake.

He escaped from the secret police _________.

• by the skin of his teeth

• by a long way

We discovered the ideal mix of paint ___________.

• by trial and error

• at first sight

When I met my fiánce it was love _________.

• at first sight

• at present

When I met my fiánce it was love _________.

• at first sight

• at present

The doctor really makes an effort to put his patients _______.

• at ease

• at random