It is on September 1st students go back to school every year.
| A．when | B．who | C．that | D．what |
David threatened ________ his neighbour to the police if the damages were not paid.
| A．to be reported | B．reporting |
| C．to report | D．having reported |
—Robert is indeed a wise man.
—Oh, yes. How I regretted ________ his advice.
| A．to take | B．taking |
| C．not to take | D．not taking |
After Queen Elizabeth officially opened the 2012 Summer Olympics, London became the first city ________ three Olympic Games in history.
| A．to have hosted | B．hosting |
| C．hosted | D．having hosted |
TV programmes, ________ to combine learning with fun together, are growing in popularity all over the world.
| A．designing | B．to be designed |
| C．designed | D．having designed |
Without thinking, he ran out, ________ at a stranger to call the fire police.
| A．shouted | B．having shouted |
| C．to shout | D．shouting |