单项选择题
A.Here and there. B.Again and again. C.As usual. D.At the same time.
A.He drives too fast. B.He plays his guitar too loudly. C.His radio wakes her children up. D.His friends are too noisy.
A.How to care for precious metals. B.A standard unit for measuring weight. C.The value of precious metals. D.Using the metric system.