---What are you busy with ?
--- We are carrying out a research _______ the causes of cancer.
| A．into | B．onto | C．to | D．in |
As the most ________ spoken language in the world，Chinese is taught in many schools in Europe.
| A．frequently | B．properly |
| C．slightly | D．differently |
Dr.Peter Spence，________ headmaster of the school，told us，“________fifth of pupils here go on to study at Oxford and Cambridge.”
| A．/；A | B．/；The | C．the；The | D．a；A |
Experts think that ________recently discovered painting may be ________ Picsso.
| A．the；/ | B．a；the | C．a；/ | D．the；a |
Take your time—it's just ________short distance from here to ________ restaurant.
| A．/；the | B．a；the | C．the；a | D．/；a |
As he reached ________front door，Jack saw________strange sight.
| A．the；/ | B．a；the | C．/；a | D．the；a |