Our teacher asked us to write a _________ letter in English this morning. 
#51905
A
ninety-word
B
ninety-words
C
ninety word
D
ninety words
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"We will learn        English words this year," the teacher said to the students.
#51555
A
one thousand, three hundred and twenty-one
B
a thousand, and three hundred twenty-one
C
one thousand, three hundred twenty-one
D
a thousand, three hundred and twenty-one
It may take _________ years to make such robots .        
#51467
A
hundred of
B
two hundreds
C
hundreds of
D
hundred
”It’s five forty-five”means(意思是)”It’s ___________.”
#51595
A
half past five
B
a quarter to five
C
a quarter past five
D
a quarter to six