HOT-AIR BALLOON =>
The first hot-air balloon was created in 1783 by two brothers, Joseph-Michel and Jacques-Ètienne Montgolfier.
CROWD => a large group of people. This is a crowd:
LAWN => grass-covered land.
In this picture, the lawn is dry, probably because it didn’t rain for a while (the grass isn’t green).
STROLLER => a small carriage with four wheels that a baby or small child can ride in while someone pushes it.