According to the information from the airline, a small sinking part of the runway of the airport is _______ for the accident.

Look! A man is cutting a tree on the moon. –It ______be true. The teacher said there is no air on the moon.

As we know, Zhao Benshan is ________ to make all the TV viewers _______.

It isfor all drivers not to drive after drinking, otherwise, they would be put into jail.

Lingling says Miss Yu has gone to Shanghai, _____ that be true—It _____ be true because I saw her in the office just now.