— When did you start to collect stamps?— I got my ______ stamp when I was ______ years old. 
#51450
A
one, seven
B
one, seventh
C
first, seventh
D
first, seven
推荐题目
About _________ people are in the People’s Park at the weekends.
#51800
A
two hundreds
B
two hundreds of
C
two hundred
D
hundred of
There are ______visitors in Hangzhou every year.
#51629
A
million of
B
millions of
C
million
D
milliones of
—How many students are there in your school?—_______ students, I think. 
#51431
A
Thousand of
B
Three thousands
C
Three thousand
D
Three thousands of
There are ________ people having lunch at this restaurant every day.
#51878
A
hundred of
B
hundreds of
C
two hundreds
D
two hundred of