21. Xiamen is _____ most beautiful city and we’ve decided to stay ______ fifth day.
A. a; a B. a; the C. the; a D. the; the
22. __________ your compositions carefully and some spelling mistakes can be avoided.
A. Having checked B. Check C. If you check D. To check
23. He had a wonderful childhood, ___________with his mother to all corners of the world.
A. travel B. to travel C.travelled D. travelling
