The train he was looking forward to ______ only a few minutes ago.
A arrives B arrived 
C arriving D had arrived
________ from endless homework on weekends, the students now find their own activities, such as taking a ride together to watch the sunrise.
| A．Freed | B．Freeing | C．To free | D．Having freed |
Few people paid full attention to their health conditions ________ they were seriously ill.
| A．when | B．if | C．until | D．after |
Children, in my opinion, ________ creative ability is unthinkably rich, ________ is seldom taken notice of by us, should be trained in that area.
| A．which; that | B．whose; which | C．which; which | D．whose; that |
A warm thought came to me ________ I might help wash my mom’s feet on Thanksgiving Day.
| A．if | B．when | C．which | D．that |
--Have you got a digital camera?
---No.
---You should buy________.
| A．one | B．it | C．that | D．this |