You must cut up ______ onion and ____ tomato first.

Evidence of a powerful volcano, which erupted under the ice sheet of West Antarctica around 325BC and might still be active now, __________ so far by British scientists.

Have you been to the theme park—Of course. I ________ it several times when I was in university.

Will you attend the meeting thisafternoon— But I toldanything about it.

Criticism and self-criticism _____necessary _____ it helps us to correct mistakes