A. goldfish B. deny C. northern D. give speeches A. visiting B. return C. underwater D. sweat A. sadly B. dawn C. bag D. just A. rubbish bin B. vary C. plenty of D. be used to A. rely on B. communicate C. error D. walk into A. sedulously B. waste C. science D. come to school A. pipe B. forty-four C. pollution D. tangyuan A. condition B. have class C. ought D. sensor A. Thursday B. Pleased to meet you C. designer D. wife A. since B. winter C. adapt D. extinction