The charity sale our school organizes every year has taught us much that we would never have________ learned in class.
| A．therefore | B．meanwhile | C．otherwise | D．instead |
It was ___ it was raining so hard that we had to stay at home all day
| A．since | B．for | C．as | D．because |
.It was in the small house ___was built with stones by his father ___ he spent his childhood.
A. which; thatB. that ;whereC, which; which D. that; which
_________ the project in time, the workers were working at weekends.
| A．Completing | B．Having completed | C．To have completed | D．To complete |
_________ many times, he finally understood it.
| A．Told | B．Telling | C．Having told | D．Having been told |
The chairman thought _________ necessary to invite Professor Smith to speak at the meeting.
| A．that | B．it | C．this | D．him |