It has been widely accepted that only when the students take an active part in the class activities _______ the most effective.
A. teaching will be B. will teaching be
C. has teaching been D. teaching has been
. With the whole village _______, the villagers had to move to higher land, waiting for help.
A. flooding B. having flooded
C. flooded D. to be flooded
The UN does not have its own army. _______, it borrows soldiers from different countries.
A. Moreover B. Anyhow C. Instead D. Somehow
. A nature reserve for white-flag dolphins was set up in 1992, _______ boats have been
prohibited from sailing around since then.
A. where B. which C. when D. what
It is surprising that Jack, who is only 39 years old, _______ in the field of engineering for 20 years when he entered the company last month.
A. worked B. had worked C. has worked D. working
. —Has the conference about building a water-power plant come to an end?
—No, it’s _______. Experts just disagree on some issues.
A. under discussion B. under control C. under consideration D. under way
