Long time no see. What have you been up to these days–I’ve been working on a research report, which was ________ easy. Which of the following can’t be put in the blank

For miles around us there was nothing but a desert, without a single plant or tree ______

What does your sister look like —______________________.

So, ________ the government has a good system of control or can educate the people, the forests will slowly disappear

The number of foreign students attending Chinese universitiesrising steadily since1990