--Would you like this pair, or that pair? ---___ will do.
| A．Both | B．All | C．Either | D．Any |
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 professor, ___________ for his excellent lectures, is popular with his students.
| A．known | B．knowing | C．to be known | D．having known |
—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; the | B．a; a | C．the; the | D．the; a |