—— I can hardly believe my eyes. Is that you, Lucy?——Yes. It has been almost 20 years______ we were together.
—Lily, _____ you _____ your ticket? —Not yet!
We couldn’t wait _______ a good rest after the exam.
Although we’ve learned English for years, we have trouble _____ the foreigners.
-----How many students are there in the classroom?------_______.
Students are supposed ________ hard at school.