If nothing______, the oceans will turn into fish deserts.
| A．does | B．had been done | C．will do | D．is done |
__ recent report stated that the number of Spanish speakers in the US would be higher than the number of English speakers by __ year 2090.
| A．A, the | B．A, / | C．The , / | D．The, a |
If you go by __ train, you can have a comfortable journey, but make sure you get __ fast one.
| A．the , the | B．/, a | C．the , a | D．/, / |
It is often said that __ teachers have __ very easy life.
| A．/, / | B．/, a | C．the, / | D．the, a |
I can’t remember when exactly the Robinson left __ city. I only remember it was __ Monday.
| A．the, the | B．a, the | C．a, a | D．the, a |
If you grow up in __ large family, you are more likely to develop __ ability to get on well with __ others.
| A．/, an, the | B．a, the, / | C．the, an, the | D．a, the, the |