Leem's homework:

1. ventilate

- We have to ventlate our house because There are a lot of dust.

-My favorite season is winter.
There are some reasons.
First, My birth day is in winter.
Second, I love snowy day because I can do many things with snow.
And last, I don't like hot days, so I like winter.

Correction:
1.
Leem: - We have to ventlate our house because There are a lot of dust.
Correct:  We have to ventilate our house because there's a lot of dust.
Explanation: In sentences beginning with here or there, the true subject follows the verb. A lot of dust is your subject so it should be there is.

2.
Leem: First, My birth day is in winter.
Correct:  First, my birthday is in winter
Explanation: birthday is a  compound noun.

Comment:
Hi Leem! :) Thank you for sending me your homework. I am really happy to check your homework and found out that you only have minor grammar lapses. You are very good in our class, Leem. Keep up the good work. See you later, Leem! :)