The question is _____ of great importance.
24. “May I go and play with Dick this afternoon, Mum?” “No, you can’t go out _______ your work is being done.”
23. In some countries, _______ are called “public schools” are not owned by the state.
22. “How long do you suppose it is _______ he left for Japan?” “No more than half a month.”
21. Mr Zhang is mild in character. He never shouts ____ he is very angry.
20. John shut everybody out of the kitchen _______ he could prepare his grand surprise for the party.