一What will the weather be like tomorrow一It be rainy ,cloudy or sunny．Who knows Even the weather report is not always right.

Do you know the reason _________ pilotsturn off the plane’s lights before taking off —The practice is for the passengers toadjust to the dark _________ an emergency.

Guo Jingming is one of_____teenager writers today, though some old writers don’t like him very much.

ot afraid of tomorrow, ______ I have seen yesterday and I love today.

We hadn’t planned to meet at that party.In fact,we met there by__________chance. [ ]