How I wish we could study _________ there are fewer exams！
| A．which | B．that | C．when | D．where |
【2015•湖南】________ the job takes a significant amount of time, most students agree that the experience is worth it.
| A．If only | B．After |
| C．Although | D．In case |
【2015·安徽】______ scientists have learned a lot about the universe, there is much we still don't know.
| A．Once | B．Since | C．Though | D．Unless |
【2015·安徽】______ he once felt like giving up, he now has the determination to push further and keep on going.
| A．Where | B．As | C．In case | D．Now that |
【2015·江苏】It is so cold that you can’t go outside _____ fully covered in thick clothes.
| A．if | B．unless | C．once | D．when |
【2015·福建】_________the students came from different countries, they got along quite well in the summer camp.
| A．While | B．Unless | C．Since | D．Until |