The most important thing _____we should pay attention to is the first thing ____ I’ve said.
| A.which; that | B.that; which | C.what; that | D.that; that | 
 The child enjoyed _____ up the wooden bricks then knocking them down.
| A.adding | B.pushing | C.piling | D.forming | 
. Mary had taken _____ to see that her guests had everything that they could possibly want.
| A.efforts | B.pains | C.attempts | D.endeavors | 
 Although John was the eldest in the family, he always let his sister _____ charge of the house.
| A.take | B.hold | C.make | D.get | 
. It isn’t so much whether he works hard; the question is whether he works _____.
| A.above all | B.in all | C.at all | D.after all | 
 The island where these rare birds nest has been declared a _____.
| A.observation | B.reservation | C.preservation | D.conservation |