It’s the fourth time that heavy smog(雾霾) has hit the city this month— It’s high time we _______ measures to fight air pollution

He won’t listen to any reason ______for your absencefrom his birthday party.

Wearing white can help people _______whenthey feel stressed.

Hi, I didn’t see you at the party in the company yesterday evening.– Oh, all my family my son’s birthday at home.

China has thousands of islands, the largest ___ is Taiwan.