We often plant _______trees every year.
#51640
A
thousand
B
thousand of
C
thousands of
D
thousands
推荐题目
Tree Planting Day is on ______ of March. 
#51094
A
twelve
B
the twelve
C
twelfth
D
the twelfth
There are ______________ birds there in the sky.    
#51475
A
Million of
B
five millions of
C
millions of
D
five millions
--- What a beautiful city our hometown is! There are many trees ___________ of the road! --- Yes, and ____________ of the trees is growing larger and larger. 
#51636
A
on both side; a number
B
on each sides; a number
C
on both sides; the number
D
on every side; the number
The earth is       years old.
#51891
A
four thousands six hundreds
B
four thousand six hundred
C
four thousand and six hundred million
D
four thousand six hundred millions