.Teachers recommend parents their children under 12to ride bicycles to school for safety.
| A．not allow | B．do not allow | C．mustn’t allow | D．couldn’t allow |
They broke intoThey broke intoprison and set free all the people in prison.
| A．the ,/ | B．/,/ | C．the ,the | D．/,the |
Tom was absent from school today. We guess he.
| A．must have overslept | B．could have been overslept |
| C．should have overslept | D．ought not to have overslept |
got into the roomthe telephone rang.
| A．He hardly had, then | B．Hardly had he ,when |
| C．He had not. than | D．Not had he, when |
In fact, radium not damaged their health, but also made the laboratory equipmentthey were wording radioactive.
| A．with that | B．with what | C．with which | D．that |
parents will surelytheir children.
| A．make no effect on | B．have some effect on |
| C．have no effect on | D．make some effect on |