If a substance is dissolved in water or heated ， it may （）a gas.
C
「句意」如果一种物质溶解在水里或被加热，它可能释放出一种气体。
「难点」giveinto为非固定搭配;giveover意为“托付，交托”;giveoff意为“散发”;giveaway意为“送掉，分发(奖品)等”。
______isnotaseriousdisadvantageinlife.
Arriving at the bus stop, _____ waiting there.
_____ if I had arrived yesterday without letting you know beforehand.