Internet users are warned to be ________ about giving away personal information to strangers.
–What’s that noise? –Oh, I forgot to tell you. The new machine ______.
__________ the kids have left home, we’ve got a lot of extra space.
The naughty boy _____ to me that the hen _____ there just now had ____ two eggs the day before.
___________ David showed the report to the public surprised me. A What B. That C. Which D. Who
—Do you still go jogging every morning? —Yes, I can’t think of a _______________ way to start a day.