In 1778, Banks was elected ______ president of the Royal Society, ______ position he held for 42 years.
Why are you leaving right now? You promised to stay ____ hours.
We asked John and Jerry, but ____ of them could offer a satisfactory explanation.
This book______18 articles , _______ three written by my father.
Chest pains can be a warning ____of heart problems.
_______ is mentioned above, the number of the students in senior high school is increasing.