Doctors recommend that all children ________ vaccinated against measles(麻疹).
| A．should | B．could be | C．are | D．be |
You had better book rooms at the hotel in advance ________ you should find no room on your arrival.
| A．so that | B．even if |
| C．in case | D．now that |
________ you are unable to deal with it, perhaps we should ask someone else for help.
| A．Although | B．While |
| C．Since | D．Unless |
You seem to have a readymade answer ________ I ask you a question.
| A．whenever | B．whatever |
| C．whichever | D．whoever |
—What has made John look like lacking sleep?
—________ he had to prepare for the coming exam and stayed up last night.
| A．For | B．Because |
| C．That | D．What |
Everyone is different and that is ________ makes our world much better.
| A．that | B．which |
| C．who | D．what |