Having a trip abroad is certainly good for the old couple, but it remains _____ whether they will enjoy it.
| A．to see | B．to be seen | C．seeing | D．Seen |
The school rules state that no child shall be allowed out of the school
during the day, ______ accompanied by an adult.
| A．once | B．when | C．if | D．unless |
__________ the students, the teacher came into the room smiling.
| A．To follow | B．Follow | C．Following | D．Followed |
I have told you the truth. ______ I keep repeating it?
A Must B Can C May D Will
Can you think of some cases ________ people can communicate only by means of body language?
| A．that | B．which | C．where | D．when |
A great number of students said they were forced to practise the piano.
| A．to question | B．to be questioned |
| C．questioned | D．questioning |