__hard before, Tom is afraid offailing in the exam

The voyages of travellers before the 17th century show that they were not ________ the sea even though they didn’t have modern navigational aids[ ]

Both students and parents appreciate the great importance schools have _______ to eyesight protection.

He is such a strong-willed person that there is nothing in the world that can _____ him.

The look on his face suggested that he that[ ]