This pair of sunglasses ____ very expensive.
| A．is | B．are | C．pays | D．does |
---Have you had a holiday recently?
--- _____ .
| A．Yes, I do. | B．Yes, I have. |
| C．No, I hasn’t | D．Yes, I did. |
This bed soft.
| A．sounds | B．smells | C．looks | D．tastes |
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 |