It’s high time that we gave ______ attention to our world climate and led a low-carbon life, or the consequence would be too serious for us to face.
| A．effective | B．gradual | C．due | D．temporary |
Their problem today is somewhat similar to _____ they faced many years ago.
| A．that | B．which |
| C．that which | D．it |
Dorothy was always speaking highly of her role in the play, ____, of course, made the others unhappy.
| A．who | B．which |
| C．this | D．what |
He made another wonderful discovery, ______ of great importance to science.
| A．which I think is | B．which I think it is |
| C．which I think it | D．I think is |
He’s got himself into a dangerous situation _____ he is likely to lose control over the plane.
| A．where | B．which |
| C．while | D．why |
I met the teacher in the street yesterday ________ taught me English three years ago.
| A．which | B．when |
| C．where | D．who |