She always thinks of ____ she can do more for her students.
New technology ______ to make sure that the cars, taxis, buses and trains we use ______ the air.
The real test of ______ English is whether they can speak, read, write and orally understand good standard English.
—I’ve taken someone else’s green sweater by mistake.—It ______ Harry’s. He always wears green.
_____ this report _____ in such a short time was quite a difficult exercise.
—Joy, how was your holiday? —I had a great time. We went scuba diving in Hainan Island.—Wow! ______