31. Hurry up! By the time we get to the church, the marriage service _____.
| A．had started | B．will have started | C．has started | D．must have started |
One of the rules is that every student ________ wear school uniform while at school.
| A．might | B．could | C．will | D．shall |
Tom took a taxi to the airport, only ________ his plane high up in the sky.
| A．finding | B．being found | C．to find | D．to have found |
Before driving into the city, you are required to get your car ________.
| A．washed | B．wash | C．washing | D．to wash |
I looked up and noticed a snake ________ its way up the tree to catch its breakfast.
| A．to wind | B．winding | C．wind | D．wound |
When ________ for his views about his teaching job, Philip said he found it very interesting and rewarding.
| A．asking | B．having asked | C．asked | D．to be asked |