A bridge made of stone lasts longer than _____ made of wood.

I’m not sure whether I can hold a party in the open air，because it________the weather．

Is that your backpack—_____ . That’s his backpack.

I’m calling to _______ our lunch appointment. It’s tomorrow at twelve o’clock, right— Absolutely.

____ seems strange to us is ______ she can sing so many English songs beautifully.