Số chẵn lớn nhất có 4 chữ số là 9998

Số lẻ bé nhất có 4 chữ số khác nhau là 1023

Tổng hai số là : 9998 + 1023 = 11021

Hiệu hai số là 9998 - 1023 = 8975 

Front

1. Where ___were____ you yesterday afternoon?

2. My mother always _____donates____(donate) money to the charity.

3. Linda _is picking up_ (pick up) the trash around her house at present.

4. We can _protect_(protect) ourselves from Covid-19 by wearing face masks.

5. __Recyling_(recycle) all the things you can to save our environment.

6. It might __rain____(rain) tomorrow.