Each of the students working hard at their lessons ________ the book—- So have I

We didn’t find________ in the picture.

I felt it rather inappropriate to turn up at the graduation ceremony ________ jeans and a Tshirt.[ ]

________ is known to us all is that Antarctica is thecoldest place on Earth.

Rio 2016 Olympics ______ in August, marking the first time that the games have been held in South America.