C1:Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question. Some birds cannot fly well, ____________ , the chicken has wings, but its flying muscles are not strong enough to be useful. C2Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question. _________ repeated assurances that the product is safe, many people have stopped buying it. C3:Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question. The weather in Dalat is neither too hot in summer________ too cold in winter. C4:Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question. Some people waste food ________ others don't have enough.