补全对话。
A: last Sunday?
B: Yes, I did. My classmates and I went to plant trees.
A: How did you plant trees?
B: First, we in the ground. Then, we
and put them into the holes.
After that, we . We watered the young trees.
A: ?
B: Yes, they are. They can stop the wind and they can make the air fresh and clean.
A: We should plant more trees.
（1）Are the trees very important to people?
（2）we brought young trees.
（3）Did you go to plant trees
（4）we used spades to dig holes
（5）got water from the river nearby.
下列各句均有一处错误，请指出并改正。
用适当的数词填空。
⑴There are ________ letters in English alphabet (字母表).
⑵There are ________ hours in a day.
⑶There are ________ days in a year.
⑷Monday is the ________ day of the week.
⑸There are ________ days in a week.
⑹There are ________ days in October.
⑺________ ________ is Christmas Day.
⑻There are ________ months in a year.
⑼Forty minus three is ________.
⑽There are ________ seasons in a year.
在括号里填写合适的英文数字。
⑴seven + ( ) =twelve⑵( ) — four=nine
⑶three × five= ( )⑷( ) ÷seven=two
⑸( ) + ten= eleven⑹() — one=twenty
⑺two × ( )= hundred⑻( ) ÷ two=five
找出数字排列的规律，填上合适的英文数字。
⑴one ________ five ________ ________ eleven
⑵three ________ ________ twenty-four ________ ninety-six
⑶twenty ________ ________ ________ twelve ten
⑷sixty-four ________ ________ ________ four two
写出下列基数词和序数词。
⑴2 1113
⑵202228
⑶363447
⑷968371