On Sundays there were a lot of children playing in the park, _______ parents sitting together joking.

How long can I ________ the book—For two weeks.

ony, why are your eyes red—I __ up peppers for the last five minutes.

There is hardly an environment on earth ______ somespecies of animal or other have not adapted successfully.

The computer system____suddently while he was searching for information on the Internet.