The experiment shows that proper amounts of exercise, if regularly, can improve our health.
| A．being carried out | B．carried out |
| C．carrying out | D．to carry out |
__________ you understand the rule, you will have no further difficulty.
| A．While | B．Once |
| C．Though | D．Unless |
—Tony, you must have noticed the student who broke the window.
—I’m sorry. I _______ attentively.
| A．studied | B．was studying |
| C．am studying | D．would study |
He didn’t seem to mind_____________ TV while he was trying to study
| A．them to watch | B．that they watch |
| C．their watching | D．watching |
Staying one day in a Shangri-la Hotel costs _______ renting a house in my hometown for a month.
| A．as much as three times | B．three times the price of |
| C．as many three times as | D．the three times price of |
_______ not to drive after drinking, some drivers are still trying their luck, which is really dangerous.
| A．Being reminded | B．To remind | C．Having reminded | D．Reminded |