Washington, a state in the United States, was named _____ one of the greatest American presidents.
The foreigner was talking to the children in the park ______ he was familiar with them.
Frank ______ London by train which ________ at 8:30 next morning.
As you get older, your _______ towards the matter will change.
–Have you finished your experiment report, Jane? --Oh, my god! I’ve _______ forgotten all about that.
We should consider what use can we make ______ such material.