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on June 15th on July 15th on July 1st on July 20th
cell soft paper organization thin fibre
to make ail drugs extremely costly to put honest warnings on all drug labels to make the buying and selling of ail drugs illegal to tell people the dangerous effects of drugs on health
1L.该溶液中含KNO3 101 g
100 mL该溶液中含KNO3 0.01 mol
从1L.该溶液中取出500 mL后，剩余溶液的浓度为0.05 mol/L
1L.水中溶解0.1mol KNO3，即可配得0.1mol/L KNO3溶液
situations happenings conditions facts
convince convey contribute conquer
celebrate the three main events in life, but in different ways are not affected by these three events celebrate these three events in exactly the same way are the same
affected have affected are affecting affect
of the celebrations they are important there are special ceremonies societies share common characteristics
将1.01g KNO3溶于100mL水配制而成 将5.05g KNO3溶于水配制成500mL水溶液 将100mL 0.2 mol·L－1 KNO3溶液加水稀释成200mL 将10.1g KNO3溶于水配制成1L水溶液
a；an；a a；a；an an；a；a ail；a；an
dictionaries completely cover the words we can make use of "schoolroom" is used in the passage as an example of a specialized term once you know how a word is pronounced and what it represents, you have turned it in-to your active vocabulary active vocabulary refers to words we understand when we read and hear them
at times on time ail the time by the time
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