He wants very much to go to college,but he is ________ about not passing the entrance examination.[ ]

Unfortunately, the element Madam Curie devoted all her life her death.[ ]

When we sleep isculturalas biological-and practices differ greatly round the globe

The computer was invented in the 1940’s and ______ quite a lot ever since

No matter what happens, you should keep _____. Just look on the bright side of things.