【题目】Limited natural resources should be made full use of ________ the ________ need of energy.

【题目】These pictures will show you ________ 50 years ago.

【题目】__________ something unexpected happens，I will meet you at the school gate tomorrow

【题目】We never allow ________ in the office．Who allows him ________ here?

【题目】Washing hands thoroughly is one of the effective ways to avoid ________ by virus.

【题目】Tony ________ have thought this book was worth ________ or he wouldn’t have read it over and over again．

【题目】When I asked if __________ would help me，Tony was the first to volunteer.

【题目】There is no light on--- they _______ be at home.

【题目】At the bad news，the woman put her hands _________ her eyes and cried out.

【题目】