.
The flu is believed by viruses that like to reproduce in the cells inside the human nose and throat.
| A．causing | B．being caused | C．to be caused | D．to have caused |
The children all turned the famous actress as she entered the classroom.
| A．looked at | B．to look at |
| C．to looking at | D．look at |
When we visited my old family home, memory came ______ back
| A．flooding | B．to flood |
| C．flood. | D．flooded |
The government plans to bring in new laws _____ parents to take more responsibility for the education of their children.
| A．forced | B．forcing | C．to be forced | D．having forced |
_________ the right kind of training , these teenage soccer players may one day grew the international stars.
| A．Giving | B．Having given | C．To give | D．Given |
Distinguished guests and friends, welcome to our school, the ceremony of the 50th Anniversary this morning are our alumni （校友） from home and abroad.
| A．Attend | B．To attend | C．Attending | D．Having attended |