(2009年合肥市高三第一次教学质量检测)The police tried to get some clues from the suspect，but he remained

These young trees must ______.

Credit cards are ________ useful when travelling— True They save us the trouble of taking too much cash [ ]

Excuse me, I want to have my bike fixed, but Ican’t find a repair shop.— I know ________ nearby. Come on, I’ll show you.

If you don’t know who _______, you can always write to me.