Either you or one of your students ________ to attend the meeting ________ tomorrow.

I like getting up very early in summer. The morning air is good _______.

The workers are pouring _____ steel into the model.

Yellow Stone National Park, ________in 1872, _________over three million visitors every year, is America’s first and foremost National Park．

—What do you think of the two students    ________     to take part in the competition?—They are hardworking as well as intelligent.