_________the fact that his first experiments had failed, Prof. Smith persisted in his research.
| A．Although | B．Regardless | C．In spite of | D．In views of |
The education of ______ young is always ______ hot and serious topic.
| A．不填, 不填 | B．the, a |
| C．不填, the | D．the, 不填 |
Apartments in cities can be quite high. Renters are paying up to $1,000 per month for _______ bedroom apartment.
| A．one a | B．the one | C．one | D．a one |
As _______ unemployment is very high at the moment, it’s very difficult for people to find _______ work.
| A．the, 不填 | B．不填，不填 |
| C．the, a | D．an, the |
He spent too much time talking on ______ phone while we were all busy at _____ work.
| A．the, 不填 | B．a, 不填 |
| C．不填, 不填 | D．the, the |
As is known to us all, _____ tiger is in _____ danger of becoming extinct.
| A．the, a | B．the, 不填 |
| C．a, 不填 | D．不填, the |