Only after they had carried out over ten experiments ______ the decision.
| A．they reached | B．they reach | C．did they reach | D．do they reach |
. 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 |
_____ 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 |
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 |
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 |
Google is testing a new television programming search service, _____ users to find shows videos from websites like Youtube.
| A．having allowed | B．allowing | C．to allow | D．allowed |