On Sundays there were a lot of children playing in the park, _______ parents were seated together joking.
| A．their | B．whose |
| C．which | D．that |
Things worthy ______ should be done without delay.
| A．doing | B．to do |
| C．being done | D．to be done |
I would have felt more comfortable if you _______ receiving my email a little more quickly.
| A．confirmed | B．had confirmed |
| C．would confirm | D．have confirmed |
Do you know how pumpkins got _______ with Halloween?
| A．associated | B．to associate |
| C．associating | D．associate |
I don’t think 200 yuan for a night in that hotel was expensive. It _________ you more.
| A．can charge | B．had charged |
| C．must have charged | D．could have charged |
The boss _________ that the workers work extra hours to complete the task.
| A．ordered | B．responded |
| C．inspired | D．required |