We can say __________ that their work is on the path of sound development.
| A．on good evidence |
| B．on good proof |
| C．on a good evidence |
| D．on a good proof of |
When ____ comes to saving energy, big changes start with small steps, like turning off the lights.
| A．that | B．this | C．it | D．one |
Of the two cameras, I would prefer ________ one, which is very easy for me to carry.
| A．a smaller | B．the smallest | C．a small | D．the smaller |
Mr Jones, a new teacher, stood in front of the students, his body ________ with fear.
| A．trembling | B．trembled | C．was trembling | D．was trembled |
.—Can you give some advice on what I said just now?
—Sorry. My mind______.
| A．is wandering | B．was wandering | C．has wandered | D．had wandered |
Having _____ no-meat day would be a good way of encouraging _____ low carbon life-style.
| A．a; a | B．a; the | C．the; the | D．the; a |