He will come ____ three days.
Scientists say it may be five years ______ it is possible to test this medicine on human patients.
Last month, the Japanese government expressed their thanks for the aid they ______ from China.
If you _____ smoke, please go outside because this is a non-smoking office.
––Who would you rather _____ your graduation ceremony tomorrow, your parents or friends?––All of them.
In that school, English is compulsory for all students, but French and Russia are ____ .