_______ that the scientist will give us a talk next month?
A、IstrueB
it在句中作形式主语，that引导的从句是真正的主语。本句运用的是疑问句式。
Our payment terms (付款方式)are ___ , irrevocable letter of credit for the full invoice value.( )
________ in thought, he almost ran into the car in front of him.
This is the first time that a woman has been ________ to the post.
We believe such an agreement will prove ____.
China is a mountainous country.Hills,mountains,and plateaus cover _______ of the total area.
