_____ mobile phone is very convenient, school children are not allowed to own one.
| A．If | B．While | C．Because | D．When |
__________ in thought，he almost ran into the car in front of him．
| A．Losing | B．Having lost | C．Lost | D．To |
_____________to somebody，a British person often shakes hands with the stranger.
| A．Introducing | B．To introduce |
| C．To be int．roduced | D．On being introduced。 |
Do you consider it any good__________the truck again?
| A．to repair | B．repairing |
| C．repaired | D．being repairing |
We're leaving at six o'clock ,and hope_________ most of the journey by lunch time.
| A．to do | B．to have done | C．to make | D．to have made |
What worried the child most was _________ to visit his mother in the hospital.
| A．his not allowing | B．his not being allowed |
| C．his being not allowed | D．having not been allowed |