If _____ without following the doctor’s instructions, the medicine may have serious side effects.
| A．Taken | B．to be taken | C．Taking | D．being taken |
__________annoyed him most was that he had received no apology.
| A．How | B．Why | C．What | D．Which |
—I__________some photos to be developed (冲洗). Are they ready yet?
—Yes. Here you are.
| A．left | B．will leave | C．have left | D．had left |
Once again he failed to hand in his homework _____ he had been given enough time to do it.
| A．in case | B．as though | C．so that | D．even though |
. _____ the book four times, I finally understood the author's theory.
| A．Reading | B．Having read | C．To read | D．Read |
Mike seldom asks ____ questions in class, but today he raised _____ fairly good one.
| A．/; a | B．the; a | C．/; the | D．/; / |