单项选择题
A．old age is the worst age B．only old people are able to give wise advice C．a wise old man may live happily D．an old man who has joined in battles can live happily
A．, by using credit cards we can spend more than we have,within a certain period of time.A. but we have to pay back later more than what we owe B．and we don’t have to pay back any other money C．but we pay back a little less than what we owe D．and we must soon pay back what we owe
A．he brought him a different watch B．he was sure Bob had stolen the watch C．he could see that Bob had a knife D．he didn’t listen to his speech