A housing bubble is an economic situation _____ occurs when house prices rise much too fast.
| A．which | B．where | C．what | D．why |
“Where did you find the professor who made the speech yesterday？” “It was in the hall ______ the students often have a meeting.”
| A．where | B．which |
| C．that | D．when |
It may have been at Christmas _____ John gave Mary a handbag.
| A．before | B．who | C．that | D．when |
_____ was very ______ that little Jim wrote the letter.
| A．It, careful | B．It, carefully |
| C．He, careful | D．He, carefully |
What is it _____ his daughter needs most？
| A．what | B．which | C．that | D．if |
Who was it _____ saved the drowning girl？
| A．since | B．as | C．that | D．he |