No Eth for accounts of private network of `truffle develop`?

I'm developing a Solidity program. I started truffle develop

> truffle develop
Truffle Develop started at http://localhost:9545/

Accounts:
(0) 0x627306090abab3a6e1400e9345bc60c78a8bef57
(1) 0xf17f52151ebef6c7334fad080c5704d77216b732
(2) 0xc5fdf4076b8f3a5357c5e395ab970b5b54098fef
(3) 0x821aea9a577a9b44299b9c15c88cf3087f3b5544
(4) 0x0d1d4e623d10f9fba5db95830f7d3839406c6af2
(5) 0x2932b7a2355d6fecc4b5c0b6bd44cc31df247a2e
(6) 0x2191ef87e392377ec08e7c08eb105ef5448eced5
(7) 0x0f4f2ac550a1b4e2280d04c21cea7ebd822934b5
(8) 0x6330a553fc93768f612722bb8c2ec78ac90b3bbc
(9) 0x5aeda56215b167893e80b4fe645ba6d5bab767de

Mnemonic: candy maple cake sugar pudding cream honey rich smooth crumble sweet treat

truffle(develop)> migrate
Using network 'develop'.

Running migration: 1_initial_migration.js
  Replacing Migrations...
  ... 0x3bfa69d31cbe12e43f20204daaf24e764a084ade586c3b417099d2e2deccc8eb
  Migrations: 0x8cdaf0cd259887258bc13a92c0a6da92698644c0
Saving successful migration to network...
  ... 0xd7bc86d31bee32fa3988f1c1eabce403a1b5d570340a3a9cdba53a472ee8c956
Saving artifacts...
Running migration: 2_deploy_contracts.js
  Replacing TutorialToken...
  ... 0x56fb0c0933ee395055db66976427f050e24dadda018b113d8f0cc03dc7229043
  TutorialToken: 0x345ca3e014aaf5dca488057592ee47305d9b3e10
Saving successful migration to network...
  ... 0xf36163615f41ef7ed8f4a8f192149a0bf633fe1a2398ce001bf44c43dc7bdda0
Saving artifacts...
truffle(develop)>

Then I setup MetaMask to connect the Private network of http://localhost:9545/. However, I cannot do any transaction because the MetaMask account has 0 ETH? How to add some test ETH for development?

Update

I realized that the account created by metamask has different addresses than the ten test accounts created by truffle develop. How to import the test account into Metamask?

Solution

When you setup Metamask you have to import the existing account (I can't remember the exact wording of the option, but you'll figure it out) and then provide the mnemonic Truffle gave you: candy maple cake sugar pudding cream honey rich smooth crumble sweet treat.