To pick up example sentences

” Prof Ahmad asked children to pick up leaves from the forest floor and observe them under a hand lens.Prashant engaged, with other volunteers, in helping the widows and children to pick up the broken pieces of their lives.But I could not find the courage to pick up the rock.Before partition, if we were to pick up the gas molecules from left container, we would be sure that these will be molecules of gas A and similarly if we were to pick up the gas molecules from right container, we would be sure that these will be molecules of gas B.The customers move into the store to pick up goods of their requirements, bring them to the cash counter, make payment and take home the delivery.But, if we were to pick up molecules from container when partition is removed, we are not sure whether the molecules picked are of gas A or gas B.