We made plans for a visit but _____ difficulties with the car prevented it.
Polly observed that she ______ by a tall man in a dark coat when she ______ the faces around her on the train.
______ is amazing to us is ______some plants can sense the soft touches of the insects on the leaves.
______ wants to enter the company must show his ID at the entrance.
I’ve heard a whisper ______ David and Alice are going to get married.
Is ______ true that the famous scientist will give us a lecture on how to predict earthquakes next week?