---Why did the teacher get angry? --- __________ what we had done the day before.
| A．Because | B．Since | C．As | D．Because of |
I was glad to meet Jenny again, ______ I didn't want to spend all day with her.
| A．but | B．and |
| C．so | D．or |
（2013·北京卷)Many countries are now setting up national parks animals and plants can be protected.
| A．when | B．which | C．whose | D．where |
（2013·大纲卷）When I arrived, Bryan took me to see the house_ I would Be staying.
| A．what | B．when | C．where | D．Which |
The children,____ had played the whole day long, were worn out.
| A．all of what | B．all of which | C．all of them | D．all of whom |
The museum will open in the spring with an exhibition and a viewing platform____ visitors can watch the big glasshouses being built.
| A．what | B．where | C．when | D．why |