Since 1970, the United Nations has been celebrating April 22^nd as Earth Day. It attracts millions of people worldwide to join in to promote public awareness of environmental protection.

A. When he offers me a lot to buy the painting, I won't sell it.

B. Were he to offer me much money for the painting, I wouldn't sell it.

C. Whatever price he offered me for the painting, I wouldn't sell it.

D. No matter how much he offers me for the painting, I won't sell it.

A. Theywerereluctant to announcethe news forfear that theymight worrythe public.

B. So that theywould worrythe public theywere reluctant to announcethenews.

C. Theywerereluctant to announcethe news lesttheyshould not worrythe public.

D. Theywerereluctant to announcethe news in caseof worryingthe public.

A. He hadn’t realized the importance of English until he missed the opportunity to study abroad.

B. Had he missed the opportunity to study abroad, he wouldn’t have realized the importance of English.

C. It was only after he realized the importance of English that he missed the opportunity to study abroad.

D. Not until he realized the importance of English did he miss the opportunity to study abroad.

A. Only after his leaving the school did Peter inform us of his arrival at the meeting.

B. Not until Peter told us that he would leave the school did he arrive at the meeting.

C. Hardly had Peter informed us about his leaving the school when he arrived at the meeting.

D. No sooner had Peter arrived at the meeting than he told us about his leaving the school.