Vincent Teo Can I say, (a) The potatoes grow in / into / under or below the ground. (b) The smoke from the factory is polluting (the air). You should add air.
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Vincent TeoCan I say,
(a) The potatoes growin / into /under or below the ground.
(b) The smoke from the factory is polluting (the air). You should add air.
(c) There are many booksin/ at the (book fair/ exhibition.
(d) He raised thenational/ national flagduring/ at /on/b