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1、 My back (ache) after sitting for a long time.
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2、 He (offer) to help me with my homework when he saw I was in trouble.
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3、 Many kinds of (disease) can be prevented by washing hands often.
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4、 Please (tidily) up your desk before you leave the classroom.
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5、 The teacher told us that this is a (seriously) problem and we must solve it.
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6、 We should be polite to the (elder) in public places.
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7、 The children screamed with (joyfully) when they got the Christmas gifts.
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8、 She (looking) after her little sister every day after school.
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9、 All his efforts to pass the test were in (vainly) because he didn't study hard.
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10、 This medicine can (easily) your toothache quickly.
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11、 We had a (pleasure) trip to the countryside last weekend.
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12、 Her (spirit) were low because she failed the English exam.
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13、 Smoking is one of the main causes of (cancers) in the world.
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14、 Let's (cheering) him up because he is feeling sad today.
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15、 He (belong) to the school's volunteer club and often helps others.
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16、 She (arrange) the flowers on the table just now.
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17、 You need to ask for the teacher's (permissible) before leaving the classroom.
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18、 The (mightily) wind blew down many trees last night.
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19、 We should help (disability) people when they are in need.
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20、 Flower (arrange) is a popular hobby among many women.