（ ） some mammals came to live in the sea is now known.

Plastics is a kind of （ ） which is widely used in industry.

I am looking forward to _____ from you as soon as possible.

Tolerance （ ） respecting the opinions of others.

Without his wartime experience, Hemingway _____ his famous novel A Farewell to Arms.

We’re talking about the piano and the pianist （ ） were in the concert we attended last night.

The audience stood and （ ） at the end of the performance.

He （ ） me to give up the holidays in Spain next month.

He was （ ） enough to see that Jake was the best candidate for the job.

The chemical factory was torn down （ ） protecting the environment.

It is important that the boy （ ） an adult to take care of him.

（） you decide to take up, you should try to make it a success.