To their disappointment, they found the lecture given by the professor difficult__________.
| A．to be understood | B．to understand |
| C．understanding | D．understood |
The manager wants to see changes in the company，and I am sure he will________.
| A．in particular | B．in turn |
| C．in charge | D．in time |
An artist who was recently traveling on a ferry to the southern island discovered________a long lost antique Greek vase.
| A．at random | B．by chance |
| C．in turn | D．on occasion |
I am always delighted when I receive an email from you.________ the party on July 1st，I shall be pleased to attend.
| A．On account of | B．In response to |
| C．In view of | D．With regard to |
________everyone here，I wish you a pleasant journey back to your country.
| A．By means of | B．On behalf of |
| C．In search of | D．For fear of |
Mrs.Smith finds it hard to clear up the mess，as her children are always ________ whenever she tries to.
| A．in the way | B．on watch |
| C．in sight | D．on the line |