take place，take action，without mercy，head to，come up with，put into operation，all of a sudden，amounts of

（1）The experiment shows that proper

amounts of

amounts of

exercise，if carried out regularly，can improve our health.
（2）It was said that Captain White whipped his crew

without mercy

without mercy

.
（3）The leaders must

take action

take action

now to promote equal opportunities for all.
（4）She and her child boarded a plane which

headed to

headed to

where her family lived.
（5）Do you think it necessary to ask for official permission for the event to

take place

take place

？
（6）Cheaper energy conservation techniques have been

put into operation

put into operation

in the developed world.
（7）Our class

came up with

came up with

the idea to make better use of used materials.
（8）I was riding along the street and

all of a sudden

all of a sudden

，a car cut in and knocked me down.