He________ the pencil and began to draw the beautiful surroundings on a sheet of paper[ ]

The researchers found clear and convincing evidence ________ happiness is the key when it comes to better health and longer lives

We know that the workers ____ all night but there is no other way. [ ]

下列关于文学文化常识的表述，不正确的一项是（ ）

I’ve read through this book several times, but I will read it ______ so as to get better understanding.