. It is clear that the whole world is passing through a social revolution in which a central _____ must be taken by scientists and technologists.
| A．process | B．attention | C．measure | D．part |
The government plans to bring in new laws _____ parents to take more responsibility for the education of their children. 
| A．forced | B．forcing | C．to be forced | D．having forced |
The fact has worried many scientiststhe earth is becoming warmer and warmer these years.
| A． | what | B． | which | C． | that | D． | though |
Frank put the mediocre in the top drawer to make sure it would not be_______ to the kids. 
| A．accessible | B．relative | C．acceptable | D．sensitive |
---Do you want a lift home? 
---It’s very kind of you, but I have a much late in the office. I overslept this morning because my morning clock _______.
| A．doesn’t go off | B．won’t gone | C．wasn’t going off | D．didn’t go on |
It is reported that the police will soon ____ the case of two missing children. 
| A．look upon | B．look after | C．look into | D．look out |