With the country’s population reaching 1.6 billion in the mid of this century, most of China’s rivers, including the Yellow River, ____.[ ]

I found ___________ more difficult to get up early because of the cold weather.

Mum,could I go to play basketball with my friends–________.But don’t stay out late.

I didn’t _________my uncle for a month.I miss him very much. Which is wrong

Jack is the ______- child in the family; he wants to have a brother.