He sits ______me. Which is wrong?[ ]

The Frenchman caught _______ a cold ______ he coughed day and night.[ ]

Do you often get online?— Yes. I ______ lots of time on it. It’s a good way to kill time.

The weather in Yang Zhou is much colder than _____ in Hainan in winter.

_____ are you staying in Tibet? — Just for four days. [ ]