I once watched _______ one-act play, which was played by _______ 11-year-old boy.
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.