It is the first time that a developing country _______ the Expo, described as the Olympic Games of economy, science and technology．
| A．is hosting | B．has hosted | C．hosts | D．will host |
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 |
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 |
This is _____ best kind of _____ pen you can get here.
| A．the, the | B．the, a | C．the, 不填 | D．a, the |
How strange! These years my birthday always falls _____.
| A．on the Sunday | B．on a Sunday | C．on Sunday | D．at a Sunday |