1. The picture is beautiful. Tom is looking at it (Which) 2. I havent seen Nga for five years (last) 3. If someone doesnt put

1. The picture is beautiful. Tom is looking at it (Which)
2. I havent seen Nga for five years (last)
3. If someone doesnt put the coal in,the fire will go out ( unless)
4. Ba spent two hours helping his mother with the housework yesterday (took)



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