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1. _______ the teacher came in, some students were drawing on the blackboard.
2. I don¡¯t know ______ Mr Li will come back
3. We are going to the zoo ___ it doesn¡¯t rain tomorrow.
4. Do you know ___ Ann will come to my house this afternoon.
5. I find ____ it is important to learn English.
When
when
if
if
that
