Rearrange the parts to make a meaningful sentence.

P. the documents, which were

Q. in a locked cupboard

R. thought to have been lost

S. in the fire, were found

Explanation

1. 01

   P names the subject and opens a "which" clause, and "were" needs its complement: R "thought to have been lost".

2. 02

   S finishes the clause with "in the fire," and brings the main verb, "were found". Found where? Q.

3. 03

   So the order is PRSQ: "The documents, which were thought to have been lost in the fire, were found in a locked cupboard."