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moclitam71
2 năm trước
tìm các phân số a/12 sao cho; 7/12<a/12<11/12 với a thuộc Z Tìm các phân số b/20 sao cho; 3/10<b/10<1/2 với b thuộc Z
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Mr Brown and some (1) .........conservationists are on a very dirty beach now. Today, they are ready to make the beach a beautiful place again. After listening to Mr Brown’s instructions, they are divided(2)................three groups. Group 1 needs to walk along the shore. Group 2 should check the sand and group 3 has to check among the rocks. Garbage must be put into the plastic bags and the bags will be (3).............by Mr Jones. He willtake the bags to the garbage (4) .................. . Each member is given a map to find the right place. They won’t eat the picnic lunch (5)................by Mrs Smith until the whole area is clean. They all look eager to work hard so as to refresh this (6)..................are 1.A. volunteer B.volunteers C.voluntary D.volunteering 2.A. inB.toC. intoD. onto 3.A. elected B. collected C. selected D. chosen 4.A. yard B. dump C. area D. place 5.A. provided B. happened C. achieved D. shown 6. A. clean B. pure C. beautiful D. spoiled

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