All flights ________ owing to the heavy fog, many passengers could do nothing but take trains.
| A．to be cancelled | B．were cancelled |
| C．have been cancelled | D．having been cancelled |
The writer told the children that she quite a few detective stories in the last few years.
| A．wrote | B．has written |
| C．was written | D．had written |
“Tony, you’d better try too much chocolate. You’re already overweight,” said the doctor.
| A．not eat | B．not to eat |
| C．to not eat | D．not to eating |
Mrs. White walks a dog in the park nearby every morning it’s rainy or windy.
| A．since | B．because | C．unless | D．until |
Most supermarkets in Shanghai have stopped free plastic bags in the past few years.
| A．provide | B．to provide |
| C．providing | D．provided |
Everyone knows fire is very useful in our daily life, it is also dangerous.
| A．so | B．or | C．because | D．but |