He _____ have completed his work; otherwise, he wouldn’t be enjoying himself by the seaside.
| A．should | B．must | C．wouldn’t | D．can’t |
20.______ that caused him to serve dinner an hour later than usual.
| A．It was we being late | B．It was our being late |
| C．It was we were too late | D．It was because we were late |
19 “Who are making so much noise in the garden?” “_______ the children.”
| A．It is | B．They are | C．That is | D．There are |
18. It was because of English girlfriend, believe it or not, ______ his English improved so greatly.
| A．which | B．as | C．that | D．what |
It was lack of money, not of effort, _____ defeated their plan.
| A．which | B．as | C．that | D．what |
I don’t know _____makes her afraid of having her business discussed.
| A．what it is about Mary that | B．that is it abut Mary what |
| C．what is it about Mary that | D．that is about Mary what |