Rearrange the parts to make a meaningful sentence.

P. the rain was so heavy

Q. turned into rivers

R. within an hour

S. that the streets

Explanation

1. 01

   P begins the "so ... that" pair with "so heavy", and S brings "that" and the result's subject.

2. 02

   Q gives "the streets" their verb, and R says how fast.

3. 03

   So the order is PSQR: "The rain was so heavy that the streets turned into rivers within an hour."