1. When .......( your camera/ steal) ? Two months ago. While I was on holiday, my camera.... (disappear) from my hotel room. 2. Is the small lot behind your house still for sale ? No, it.... (sell) last month, and a new house ... (build) on it next month. 3. I ....... (leave) some papers on the desk last night and i can`t find them now. They....... ( might/ throw) away

1. When was your camera stolen ?
  Two months ago. While I was on holiday, my camera was dissapearing from my hotel room. 

( while thường có was/were + Ving trong 1 vế mà vế trước không có thì vế sau phải có => was dissapearing )

2. Is the small lot behind your house still for sale ?

No, it was sold last month, and a new house will be built on it next month.

( last month -> quá khứ đơn nhưng it là vật => bị động; next month là tương lai đơn, a new house là vật => bị động)

3. I left some papers on the desk last night and i can`t find them now. ( last night -> quá khứ )

They might be thrown away

( might là quá khứ rồi nên không cần thêm gì nữa, they là some papers => bị động )

Chúc bạn học tốt !!