____ up late at night is bad for your health.
A. Stay B. Staying C. stays
Vienna,the capital of Austria,isthe River Danube and The Blue Danube is auss.
| A．on; for | B．in; by | C．on;by | D．by;on |
Where's Tom? His mother ______ him now.
| A．is looking for | B．will look for | C．has looked for | D．looks for |
You will find ______ useful to learn even a little English.
| A．it | B．it was | C．that | D．this |
By the first day of August, 2007, the PLA ________ for eighty years.
| A．founded | B．has founded |
| C．has been found | D．had been founded |
Have you ever gone?
| A．surfing | B．to surf | C．surf | D．surfed |