—Have your read the article A Dirty Beijing, which is about air pollution?
—Yes. It’s highly informative. I _____no idea that the PM2.5 there sometimes reached 300.
A. have B. had C. will have D. would have
—What do you think of being a volunteer, John?
—I find it a stressful job but one ___ you can really help people.
A. where B. which C. when D. that
—Is there anything wrong, Bob? You look sad.
—Oh, nothing much. In fact , I ____ of my friends back home.
A. have just thought B. was just thinking
C. would just think D. will just be thinking
It is not always easy for the general public to see _____use a new invention can be of to their daily life.
A. which B. what C. that D. whose
More highways have been built in China, ______ it much easier for people to travel from one place to another.
A. having made B. made C. to make D. making
To her joy, Della earned first the trust of her students and then ____ of her colleagues.
A. one B. ones C. those D. that
