._______a bicycle to use,you have to insert a special card.
______ students passed the exam although it was a little difficult.
As we all know, many Chinese words have come into English, ___ typhoon, tofu and kung fu.
Try to _____ the children down. They’re too excited.
I am very grateful for your assistance, and hope that one day 1 may be able to do something for you__________.
--- How are you _______ with your study at present?--- very well.