In 1989, a(n) _______law was passed by the United Nations to stop people putting waste into sea.
| A．national | B．local | C．internet | D．international |
— You look tired.
— Yes. I ___ non-stop until 8 o’clock this morning.
| A．had worked | B．work | C．have worked | D．was working |
People are living in ___ world where mouse clicks rule our life, so online searches have become _____ must.
| A．the; / | B．/; a | C．a; a | D．a; the |
Here are some Christmas presents, ____you can choose one for yourself.
| A．in which | B．from which | C．between which | D．through which |
Many political leaders attended the conference and among those present ____ the foreign minister and his wife.
| A．were | B．included | C．had | D．remained |
--- You should have gone to see the film. It’s very moving.
---______, we arrived too late to catch the last bus.
| A．Absolutely | B．Gradually | C．Constantly | D．Unfortunately |