The experiment shows that proper amounts of exercise, if regularly, can improve
our health.
| A．being carried out | B．carrying out |
| C．carried out | D．to carry out |
A big dust storm covered Sydney for hours, ______ the Sydney Opera House invisible．
| A．made | B．making |
| C．make | D．to make |
---Hi, Terry, can I use your computer for a while this afternoon?
---Sorry．______．
| A．It’s repaired | B．It has been repaired |
| C．It’s being repaired | D．It had been repaired |
---How can I apply for an online c
ourse?
---Just fill out this form and we______ what we can do for you．
| A．see | B．are seeing | C．have seen | D．will see |
---Where were you when I called at your house this morning?
---Oh, I_____ for a friend from Tokyo at the airport．
| A．had waited | B．am waiting | C．have waited | D．was waiting |
Plastic bags are provided for our convenience but they have also_______ the pollution of the environment．
| A．adapted to | B．turned to | C．contributed to | D．looked forwarded to |