The headmaster was dismissed three months ago.The post is too important to leave　　 any longer,especially before the college entrance examination.

This is a(n)　　arrangement,not a permanent one.

    -- I have warned him of the danger but he insisted on going there alone. -- What a _______ boy!

 Landing safely in bad weather is a _______ task for any pilot, and even the smallest error can lead to a disaster.

. All the students were____ when they heard the_____ news.