Teachers'Day greeting cards can be made as follows:

Tools required: colored cardboard, glue, scissors.

1. Prepare seven small square colored papers of different colors.

2. Take one of them and fold it in half, and draw the shape of half the cross section of the hot air balloon on it.

3. Cut along the contour with scissors, making seven out of each one.

4. Stick these seven pieces of paper together in sequence.

5. Stick to the upper left corner of the yellow rectangular cardboard.

6. Draw the shape of a hot air balloon basket on the red card paper and write words on it.

7. Cut it out, stick it on the card paper, and use a black pen to connect the hot air balloon with the basket.

8. Finally, write down "Happy Teachers'Day" on the card, and the Teachers' Day greeting card will be ready.