I can’t remember I put the book, and I need it for my homework now.

Everyone knows that________ is dangerous to play with fire, but________ is difficult is to prevent children from playing with fire.

Hardly _____ any mistakes in his working here during these three months. [ ]

Have you finished the work yet— Not yet. I need two more days.

This is the second time I _______ the Himalayasas a college student