—The little dog saved his owner in the fire. —Oh, ____________it was!
| A．How brave dog | B．What brave dog |
| C．How a brave dog | D．What a brave dog |
Betty has studied Chinese _____ a year.
| A．for | B．since | C．in | D．before |
Scientists think that there _____ life on Earth for millions of years.
| A．has had | B．have had |
| C．has been | D．have been |
Some scientists have sent a spacecraft to Mars. It ____ several months to get there.
| A．spent | B．has spent |
| C．has taken | D．take |
Do you know thegirl ?
| A．5—years--old | B．5—year—old |
| C．5 years old | D．5—year-- older |
--- Where’s Mary? --- She _____ to Harbin.
| A．has been | B．has gone | C．goes | D．went |