They seemed to be ____________________ something they had lost. (四处寻找)
— Can I help you?— Do you have any of Michael Jackson's CDs ? I would like to buy _____.
Tens of thousands of trees _____ in the area in the past few years.
— I'm wondering why the visitors chose to stay with the host family.— _____real local life.
How long do you think it will be _____ we can find a new water source?
High up in the mountains _____ a quiet small village, with only 20 households.