单项选择题—Did you get a job —No, I ______ , but it's no use.
单项选择题The police still haven' t found her, but they' re doing all they ______ .
单项选择题It is reported that many a new house ______ at present in the disaster area.
单项选择题John opened the door. There ______ he had never seen before.
单项选择题To improve the quality of our products, we asked for suggestions ______ had used the products.