．We can never expect _________ bluer sky unless we create ________

．We can never expect _________ bluer sky unless we create _________ less polluted world.

#7748

a；a

a；the

the；a

the；the

推荐题目

—No dessert for me, please. I’m on ____ diet.—Why not just take one bite of ____cheese cake? I’m sure you will love it.

#9194

a; a

/; the

a; the

/; a

Gillard's ride to     top of Australian politics was        rough one.

#9045

不填; a

the; a

a; the

a;不填

In ____late 19th century, computers changed _____great deal and were widely used______international trade.

#10114

the; a; the

the; the;不填

the; a; an

the; a; 不填

Do you still consider the child _______ ?

#9131

an honest boy

a honest boy

honest boy

the honest boy

Robert is interested in ________ astronomy and he wishes he could make a trip into ________ space one day.

#7696

the; the

an; the

an; /

/; /