You want to know what the safest place for children 77．______
is in the car The experts say the back seat is the safest for 78．______
them. The back seat is farthest away off the force of a head- 79．______
on collision(迎头撞击), which can lead serious injuries. 80．______
If your child is below 8 and weighs no more than 85 81．______
pounds, it is necessarily to fit your car with a safety seat. 82．______
Moreover, the safety seat must be held in place of on the83．______
car’s back seat. If your child do need your attention while 84．______
you driving, don’t look back with only one hand on the 85．______
wheel. You’d better stop the car. 86．______
参考答案：of
解析： 此处考查固定短语。此句的意思是“安全椅必须安放在后座合适的位置”，短语be in place的含义是“在合适的位置”。be in place of的含义不符句意，它表示“替代，取代”，介词of面必须有名词性成分。所以去掉of。