My friend David was not used _______ by air, so he felt unwell(不舒服).
Forests ________ and burned at such a speed that they will disappear from the earth in the future.
—I’ve got a cough and my chest hurts.—________.Let me examine you.
What I need is ________ book that contains ________ ABC of oil painting.
Sam insisted that he________ the law and________.
—________ when has the country been open to international trade?—1978,I suppose.