After describing the planned improvements, she went on _______ how much they would cost.
| A．to explain | B．explaining | C．to be explaining | D．having explained |
I'll go to the library as soon as I finish what I .
| A．was doing | B．am doing |
| C．have done | D．had been doing |
Sarah looked atfinished painting withsatisfaction.
| A．不填；a | B．a; the | C．the; 不填 | D．the; a |
Tom asked the candy makers if they could make the chocolate easierinto small pieces.
| A．break | B．breaking | C．broken | D．to break |
In our class there are 46 students, _____ half wear glasses.
| A．in whom | B．in them | C．of whom | D．of them |
All the photographs in this book, _______ stated otherwise, date from the 1950s.
| A．unless | B．until | C．once | D．if |