We are confident that the step the Chinese governmenthas taken to cope with the current crisis is ______ of great significance

－Is John coming by train?－He __________, but he can’t. All the trains have been cancelled because of the snow.

Every morning I wake up after my alarm clock ____ at six.

_________to see us, theprofessor gave us a warm welcome.

Only by practicing a lot _____ our English well enoughto communicate with foreigners