a.Today is the first day of school. Some students at the bus stop. They for the school bus.
b.The students see the yellow school bus coming. The is Marshall. She is very nice.
c.The children on the bus. They talk and sing. They their seat belts.
d.The first day of school is a happy day.

a. meet, wait
b. driver, Ms.
c. sit, wear
d. always

a. 图中显示学生们在公交站，结合语境“在公交站”用meet，“等校车”用wait，主语是复数，动词用原形。
b. 图中是校车司机，“司机”是driver，“Marshall女士”用Ms.。
c. 图中孩子们在公交车上坐着，“坐”用sit，“系安全带”用wear，主语是复数，动词用原形。
d. “总是快乐的一天”用always。

Watch for cars and bikes. () Play far from the street. ()
Run on the street. ( ) Take your friend's hand. ()
Play football on the street. ( ) Wear the seat belts in a car. ()
Run after a bus. ( ) Stop for a red light. ()
Don't stand too close to the street. ()
Look to the left and to the right before you cross the street. ()

正确的选项应该被勾选，即：Watch for cars and bikes.（√）
Play far from the street.（√）
Run on the street.（ ）
Take your friend's hand.（√）
Play football on the street.（ ）
Wear the seat belts in a car.（√）
Run after a bus.（ ）
Stop for a red light.（√）
Don't stand too close to the street.（√）
Look to the left and to the right before you cross the street.（√）

根据冀教版英语六年级上册12单元"Be Safe on the Way"关于道路安全的内容，正确的安全行为包括注意车辆、远离街道玩耍、乘车系安全带、红灯停、不靠近街道、过马路左右看。