Question

Proper ways for:
Several students presented‭ ____________ ‬oral reports in Spanish.
Other students delivered‭ _____________ ‬speeches in English.
‎ ‏Someone left‭ ____________‬note cards on the front table.
Neither of the boys knew‭ _____________ ‬teacher had already graded them.
‎ ‏Only seniors can eat‭ ______________ ‬lunch on the commons lawn.
Teachers can take‭ _____________ ‬breaks on or off campus.