The teacher __________ have thought Johnson was worth it or she wouldn’t have wasted time on him, I suppose.
| A．should | B．can |
| C．would | D．must |
.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 |
It was not until nearly a month later _________I received the managers reply.
| A．since | B．when | C．as | D．that |