Jim is a little upset recently.–No wonder! He is __________.

The experiment is of particular importance.　　　　—I see. We will carry on with it ________ we can get enough money.

The school principal himself ________ a prize in English to the best student at the opening ceremony.

The manager ordered that the work ________ at once.[ ]

The river runs_______ the city. And there are many beautiful bridges_______ the river.