I have just received an invitation from a good friend of mine, asking me to pay a visit to ______ we used to study together.
Though many extra trains and buses are used to carry passengers, traffic tools are still ________ needed during the Spring Festival.
Mary once taught English in a remote village school as a volunteer, which is ________ only on foot.
Cheer up! No matter how ________ you progress, you are ahead of those who never tried.
As the idea of lowcarbon life is now ________ accepted, more and more people travel by public transport.
Worried about the time ________, Mary had made a list of the sites she wanted to see in Beijing.