The following dialog is for questions 1 to 4.

Randy : Kinar, is this your picture with the mayor?

Kinar : It is. How did you get that?

Randy : My sister just sent it to me. She said this photo was taken on the last week's green ideas competition at the city hall. Did you win the competition?

Kinar : Well I was placed second.

Randy : Wow! Congratulations! What did you win? Interesting prizes, I suppose.

Kinar : Well I received a certificate and money. Oh yeah, my idea will be developed in a real life.

Randy : What is your idea?

Kinar : I propose an irrigation system to harvest rainwater in tanks for the farm in mountainous areas which have few water sources. This system is perfect for small plantations.

Randy : That's cool I hope the system is helpful for our farms.

Kinar : Thanks. 

"I propose an irrigation system to harvest rainwater ..."

The underlined word can be best replaced by ...