He wondered if he could slip out of the lecture hall without anyone______.
| A．noticing | B．noticed | C．to notice | D．being noticed |
—How dangerous it was!
—Yes, but for the passerby's quick action, the girl ________.
| A．was drowned | B．could have been drowned |
| C．had drowned | D．should be drowned |
Martin hasn't got in touch with me for ages. He ________ my new cell phone number.
| A．can't get | B．mustn't get |
| C．can't have got | D．shouldn't have got |
According to the rules and regulations, all payments ________ be made in cash in the shopping center.
| A．shall | B．can |
| C．must | D．should |
—Show me your permit, please.
—Oh, it's not in my pocket. It ________.
| A．must have fallen out | B．might fall out |
| C．could fall out | D．should have fallen out |
People love the convenience of bottled water, but if they ________ the problem it causes, they ________ try carrying water in a reusable steel container instead of plastic.
| A．realized; will | B．had realized; will |
| C．realized; would | D．have realized; would |