【推荐1】Air pollution prevents people from ________ (see) things clearly. (所给词的适当形式填空)

【推荐2】Whether he can do the job as well as he promised remains ________ (see). （所给词的适当形式填空）

【推荐3】The last decade _________ (see) a sharp increase in housing prince, which is a common result in the process of urbanization. (所给词的适当形式填空)

【推荐1】Many high-speed trains have been built in China, _________ (make) it easier for people to travel from one place to another. (所给词的适当形式填空)

【推荐2】________ (see) from the top of the mountain, we can get a wonderful view of the city. (所给词的适当形式填空)

【推荐3】Yesterday, another student and I, __________ (represent) our university’s student association, went to the Capital International Airport to meet this year’s international students. （用单词适当形式填空）

【推荐1】He said he much regretted not ______ (be) able to help. (所给词的适当形式填空）

【推荐3】________ (save) a little money, Jane was able to buy her mother a lovely new watch. (所给单词的适当形式填空)