With modern equipment,many mysteries have ____ to light in recent years.
—Who is late for class again?—________you ask?Tim,of course.
—Why don’t we choose that road to save time?—The bridge to it________.
We complained to the travel agency about the horrible service during our trip,but no one has________by now.
The headmaster has retired but no one knows who will________him in the post.
The weather is concerned with all of us because it________us so directly—what we wear,what we do,and even how we feel.