e of fire, stay low to the ground in asmoky room, ________ smoke always rises towards the ceiling.

He ________ stay at home and look after his mother yesterday.

What _________ pity you didn’t go to ______ concert with us! It was so exciting!

Though having lived abroad for years, many Chinese still________the traditional customs.[ ]

The prime minister said that ______ students lack nowadays is devotion and patience.