Years ago we didn’t know this, but recent science _______ that people who don’t sleep well soon get ill.
| A．showed | B．has shown | C．will show | D．is showing |
As we all know, it’s not polite to keep others_________for a long time.
| A．wait | B．waited | C．to wait | D．waiting |
An official_________by some reporters on food problems in Shanghai yesterday.
| A．is interviewing | B．is interviewed | C．was interviewing | D．was interviewed |
We are glad to hear that the Greens_________to a new flat next week.
| A．moved | B．moved | C．will move | D．have moved |
Now my father_________his bike to work every day instead of driving.
| A．ride | B．rode | C．rides | D．will ride |
By the end of the last month, I_________all the CDs Of Justin Bieber.
| A．collect | B．collected | C．have collected | D．had collected |