—I have worked hard at English, but it seems that I haven’t made any progress.—Keep on _____ at it, and you will be successful.
They arrived _____ Shanghai_____ the morning of May 2.
–Have you ever been to the zoo? ---__________
A young man _______John bought this expensive present.
---My grandfather is ill today. ---_________
We will have a _________ holiday after the exam.