1. _____ his arrival at the airport, he was arrested by _____ police.
A. By; the B. In; a C. On; the D. With; 不填
2. It’s important for us to use a word or phrase according to the _____ in language studies.
A. situation B. translation C. expression D. condition
3.－It is a long time _____ I saw you last.
－Yes. And it will be a time _____ we see each other again.
A. when; before B. after; when C. since; before D. before; since
