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vanminhngo80
2 năm trước
Cho hình chóp SABC ,SA vuông góc (ABC),SA=a✓3, tam giác ABC vuông cân tại B có AB=a .tính góc giữa 2 mặt phẳng (SBC) và (SAB)
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I.Put the verbs into the correct form (past progressive). 1.When I phoned my friends, they (play) ____ monopoly. 2.Yesterday at six I (prepare) ____ dinner. 3.The kids (play) ____ in the garden when it suddenly began to rain. 4.I (practice) ____ the guitar when he came home. 5.We (not / cycle) ____ all day. 6.While Alan (work) ____ in his room, his friends (swim) ____ in the pool. 7.I tried to tell them the truth but they (not / listen ) ____ . 8.What (you / do) ____ yesterday? 9.Most of the time we (sit) ____ in the park. 10.I (listen) ____ to the radio while my sister (watch) ____ TV. 11.When I arrived, They (play) ____ cards. 12.We (study) ____ English yesterday at 4:00 pm . II.Write correct sentences: Yesterday at 6 pm your family were doing different things. Write positive sentences in past progressive. 1.My mother / read / a novel .................................................. 2.My father / watch / a movie .................................................. 3.My elder sister / writing / in her diary.................................................. 4.My two brothers / listen / to the radio.................................................. 5.My little sister and I / not / watch / a movie.................................................. 6.We / talk / about school..................................................

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