A. thousands
B. thousand
C. thousand of
D. thousands of

1 ________ + three = nine  
2 four - ________ = two
3 eight + one = _________
4 six - ______ = seven
5 six + _______= seven    
6 four + four = _______
7 one + ______ = one    
8 five + one = ________
9 _______ - three = four  
10 two + _______ = six

1. Tom has _______(12) color pens.
2. Tom's birthday is August ________(12).
3. Is March the _______(3) month of a year?
4. There are ________(90) students in her class.
5. The new skirt are ________(100) yuan.

1. There are usually(通常)t_________ days in February.
2. - When is your b_______, Tina?  
    - It is July 5th.
3. John is fifteen y________ old.
4. We have an Art F__________ each year.
5. H_______ old is your father?
6. O_________ 1st is our National Day(國慶節(jié)).
7. - How much is it?   -- It is 20 d_________.
8. The birthday p_________ is October tenth.
9. The sixth month of a year is J___________.
10. The last month of a year is D___________.

A. eighteen years old  
B. eighteen year old  
C. eighteenth years old  
D. eighteenth years old