Exploring the polar regions is a _______ issue because it may destroy the ecological environment there.[ ]

Linda, Icalled you this morning, but nobody answered the phone.—I’m sorry. I footballwith my friends then.

One needs much experience and knowledge ________ one’s correct decisions.

_________many children like KFC, I thinkthey’d better try not to eat it too often.

you your dictionary—No. So I have to buy a new one today.