How many pens are ___________on the desk?

Is your new team-mate a good guy?— Yes. He is kind, skillful, hard-working and intelligent; ____, I can’t speak too highly of him.

Where is Gina?—She is between Lucy and ____.

There is ________”u” and ________”h” in the word “hour”.

______is the Changjiang river in China, do you know?—Yes, it’s about 6,380 kilometers long.