Although he is young, he is quite experienced. __________  __________ he is，he is quite experienced.
I came across an old friend in the street yesterday. It was __________  __________  __________  __________ I
came across in the street yesterday.
A robot is a machine designed to do jobs that are usually performed by humans.
A robot is a machine __________  __________ designed to do jobs that are usually performed by __________  __________
She shouted at her boss angrily and ran out of the office.
She shouted at her boss __________  __________ and ran out of the office.
We advised him to start at once.
We suggested that he __________  __________ at once.