A. I think so.
B. Don’t mention it.
C. Please take it easy.
D. What’s the matter
E. And you
F. I’d love to.
G. But he panned to.
H. Me, too.
Friend A: How’s everything with you
Friend B. Fine, thanks. ______

A. paving material
B. cement
C. concrete
D. the coal by-product

A. Fishes only "speak" to communicate with each other.
B. Researches are now being made to study the significance of fish sounds.
C. Sea animals have a sharper hearing ability than men.
D. Sounds made by fish cannot be transmitted through the air.