The problem is so complex that I'm afraid it will take me several hours to________．
| A．figure out | B．set out |
| C．break out | D．put out |
31. Researchers now have some proofs ______ reading the Roman alphabets and Chinese
characters uses different parts of brain.
where B. when C. which D. that
30. He _____ his potential had it not been for his desire to meet new challenges.
| A．would never have realized | B．would never realize |
| C．never realized | D．had never realized |
29. _____ the lack of workforce in many industries, workers are now commanding higher salaries than they used to be.
| A．Regardless of | B．Due to | C．In case of | D．According to |
28. No decision about any future plan until we have done a thorough research of the teachers’ preference.
| A．has been made | B．is made | C．is being made | D．will be made |
27. As five children under 10 got drowned in a southern province, it is not socially _____ for
parents to leave children unattended at that age.
| A．acceptable | B．affordable | C．sustainable | D．believable |