1) the cause for leaving; 2)the days: from 16th to 21st; 3) catch up on the lesson after retur...

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（1） only any of （1）, （2） and （3） any of （1） and （3） any of （1） and （2）

to tell, to leave telling, leaving to tell, leaving telling, to leave

any of （1） and （3） any of （1） and （2） any of （2） and （3） any of （1）, （2） and （3）

upset; leaving upsetting; leaving upset; would leave upsetting; would leave

just left has just left is just leaving was just leaving

(1)+(2) (1)+(3) (2)+(3) (1)+(2)+(3)

is leaving, takes off leaves, takes off is leaving, is taking off leaves, is taking off

1eaves；takes off is leaving；takes off is leaving；is taking off 1eaves；is taking off

1 2 3 4

leave leaving t

（1） and （2）（1） and （3）（2） and （3）（1）, （2） and （3）

whether are they leaving for whether they are leaving for if they are leaving for if are they leaving for

（1） only is correct （2） only is correct both （1） and （2） are correct neither （1） or （2） axe correct

leaves; takes off is leaving; takes off is leaving; is taking off leaves; is taking off

1eft any any left leaving any any leaving

are leaving have left were leaving will leave

whether are they leaving for whether they are leaving for if they are leaving for if are they leaving for