课时作业19（必修4，module 1） ⅰ．完成句子 1．当心！前面危险！ ______ ______！there's a danger ahead. 2．我们所依赖的资源迟早会枯竭的。 the resources we ______ ______ will ______ ______ sooner or later. 3．该到我们改掉坏习惯的时候了。 it's time that we ______ ______ ______ our bad habits. 4．你太年轻了，不懂得这些事情。 you are ______ ______ ______ understand such things. 5．无论它有多贵，我都要买下它。 ______ ______ ______ ______ it may be，i'll take it. ⅱ．单项填空 1．the motorway was closed because of the thick fog，so we had to find a（n）______ route. a．competitive b．effective c．collective d．alternative
