The _________ on his face was kind of strange, when I told him the news.
| A．appearance | B．looking | C．expression | D．description |
_______ his scientific work, he has no time to care for his family affairs, _______, of course, his wife always complains about.
| A．devoted to; which | B．Devoting to; which |
| C．Being devoted to; that | D． Devoting to; that |
The silence in the dark building was scaring. No sound and voice____ heard at that moment.
| A．Were | B．Was | C．Is | D．are |
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 |
________ you happen to see Mary, would you please ask her to come here?
| A．Would | B．Could | C．Should | D．Might |
Everyone knows that _______ is dangerous to play with fire, but _______ is difficult is to prevent children from playing with fire.
| A．it, it | B．what, what | C．it, what | D．what, it |