Transact SQL :: Pivot With Multiple Columns

I have one table like this.

-- drop table #temp
create table #temp(ID bigint, Description varchar(50), ET varchar(200), ET_Status varchar(50), ET_Date datetime, ET_IsValid varchar(3))

insert into #temp
select * from (values (1,'Test','A', 'Ack','08/15/2015', 'Yes'),(1,'Test','B', 'Nack','08/17/2015', 'Yes'),(1,'Test','C', 'Ack','08/21/2015', 'Yes')) a(ID, Description, ET, ET_Status, ET_Date, ET_IsValid)

I want to pivot this. My expected result look like this.

ID - Description - ET_A_Status - ET_A_Date
- ET_A_IsValid -  ET_B_Status - ET_B_Date
  - ET_B_IsValid - ET_C_Status  - ET_C_Date
-
ET_C_IsValid 

1  - Test    - 'Ack'       - '2015-08-15 00:00:00.000'  - 'Yes'   -  'Nack'  - '2015-08-17 00:00:00.000'  - 'Yes'  - 'Ack'   - '2015-08-21 00:00:00.000' -  'Yes'