A:甲烷和乙烯
B:苯和四氯化碳
C:水和苯
D:氯化钠和硝酸钾
从方框中选择恰当的词或短语并用其正确的形式填空(每个词或短语只能用一次)。
busy; difficult; dream of; be covered live ; arrive in; be away;
row a boat; in one's fifties; out of control ; have a chat with