单项选择题
A．became disappointed B．got angry C．lost interest D．could not continue the conversation because he did not know what else he could say
A．they found it no use doing so B．they liked staying at home C．there was no modern transportation D．they were forbidden to go to other countries
A．it is interesting B．it is cheaper than to go in any other way C．it can cross the wide oceans D．it takes less time