Vitamin D helps our bodies make a special chemical，and this special chemical, ______
affects our brains，making us feel happy．
| A．in turn | B．in particular | C．in advance | D．in short |
It’s ten years since the scientist ___on his life’s work of discovering the valuable chemical.
| A．made for | B．set out | C．took off | D．turned up |
Although there are no classes in the afternoon now, no student ______ go out of school without the head teacher’s permission.
| A．will | B．must | C．may | D．shall |
Though _______ money, his parents managed to send him abroad.
| A．lacked | B．lacking of | C．lacking | D．lacked in |
Nowhere else in such a small town, I think _____ a book as good as this one.
| A．you get | B．you can get | C．can you get | D．you will get |
--- I’m going to have lunch. Do you mind talking about your plan _____ lunch?
---All right.
| A．during | B．before | C．over | D．until |