Students are encouraged to _________ the design competition for robots at the university.
| A．take part | B．operate | C．join to | D．participate in |
He’ll come _______ I promise him to buy that new dictionary.
| A．so long | B．on condition that | C．as soon as | D．by the time |
When you finish reading the book, you will have ________ better understanding of ______ life.
| A．a; / | B．the; a | C．/; the | D．a; the |
When the police arrived, the crowd made off _____ all directions.
| A．in | B．to | C．at | D．for |
Recently, employees at the Shanghai Metro’s Railway Station Stop have been busy learning dialects from other parts of the country, ___________ aims to provide better service to travelers from outside the city.
| A．where | B．that | C．which | D．it |
Professor Smith, along with his assistants, ________ on the project day and night to meet the deadline.
| A．work | B．working | C．are working | D．is working |