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một vật có khối lượng 0,5kg rơi tự do từ độ cao 20m xuống đất. chọn gốc thế năng tại điểm rơi a.tính thế năng của vật tại điểm bắt đầu rơi b. tính thế năng của vậy tại điểm sau khi nó trơi được 1s
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VI. Write the correct form or tense of the verbs in brackets. 1.Vietnamese people …………………..……….. (celebrate) Lunar New Year every year. 2.This Tet, my family ……………………………(not buy) Chung cakes. We will make them. 3.We usually ………….….(stay) at home on holiday, but this holiday we …………. (travel) abroad. 4.You shouldn’t ……………….………………….(wear) white clothes on the first day of Tet. 5.People spend a few days ……….……………………………(clean) their houses before Tet. 6.Tet …………………….…………………………..(occur) in late January or early February. 7.Miss Helen (help)…………………… us as soon as she (finish)...................................that letter. 8.Phong loves ………………………………………………...(eat) traditional food during Tet. 9.You must …….…………………………………….……(take) a boat ride around the island. 10.After …..…… (get) up, children get dressed in new clothes and say wishes to their parents.

Exercise : Chia động từ trong ngoặc ở đúng thời 1/ When I (arrive) ....................at his house, he still (sleep)................. . 2/ The light (go) ........................out while we (have)................................ dinner. 3/ The last time I (see).................... him, he (wear)................... a grey suit. 4/ Just as I (leave)........................ , a student (stop).....................me in the hall 5/ Nam (play) ................football when he (break)................. his leg. 6/ We (drink) ....................a lot of beer at the party the day before yesterday. 7/ They (build) ................a new bridge when I was there 2 months ago. 8/ He (sit).......................... in a cafe when I saw him. 9/ My company (make).................... a lot of profits 5 years ago. 10/ What you (do) ........................when I phoned you on Monday ? 11/ While the two thieves (argue).............., someone (steal)........................ their car. 12/ When he was a boy at school, Edison (ask) .......................a lot of questions. The teacher (think) ....................he was stupid and she (send) .................him home. Edison's mother (teach) ..............her son at home and he (begin) to carry out a lot of experiments. 13/ - You (visit).................. the zoo yesterday ? - Yes, I did. When I (go)........................ there, I (see)........................ our teacher. 14/ Who (invent).............................. the radio ? Giúp mik với mn

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