A study that was published in January 2001 found that when children (1)_________ less, they behaved less (2) _____________. Students in a California elementary school participated in the study, which lasted (3) _________. By the end of the study, the children's behavior had changed. For example, the children's (4) _________ reported that the children were acting less violently than before. During the study, the children kept a record of the (5) ________ they watched TV. Then, for ten days, they (6) _________. Near the end of the study, the students began to suggest watching (7) _________.

Put the verbs in brackets in the present perfect or the simple past tense. 
1. It is very hot. Summer (come) _________. 
2. They (study) _________at this school for 7 years now.
3. They (begin) _________ to study at this school 7 years ago. 
4. Since when (you know) _________ her ? 
5. How long ago (he start) _________to learn French ? 
6. She (lose) _________ her handbag on the train yesterday morning.
7. My mother (be) _________ in hospital for a long time and she cannot go home yet. 
8. His dog (just run) _________ out of the garden. 
9. Mr Brown (travel) _________ by air several times in the past. 
10. He (travel) _________to Mexico by air last summer.

Fill in each gap with one suitable word.

  At school, children study (1)........... In literature, they learn about (2)........... and authors. In (3) ..........., they learn about numbers and calculations. In history, (4)............ study important (5)............ in Vietnawm and around the (6)............. Geography helps them know (7)............. different countries and theri people. They also study many (8)............. things such as foreign language, sports and (9)........... It's very interesting. They (10)............. all of them.

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Fill in each gap with one suitable word :

  At school, children study (1)........... In literature, they learn about (2)........... and authors. In (3) ..........., they learn about numbers and calculations. In history, (4)............ study important (5)............ in Vietnawm and around the (6)............. Geography helps them know (7)............. different countries and theri people. They also study many (8)............. things such as foreign language, sports and (9)........... It's very interesting. They (10)............. all of them.

Các bạn giúp mình với, nhanh nhé ! Mình đang gấp !

Put the verbs in brackets in the past simple or the past perfect tense.

1/ They (go) __________ home after they (finish) __________ their study.

2/ He (do) _________ nothing before he (see) ___________ me.

3/ He (thank) __________ me for what I (do) __________ for him.

4/ I (be) __________ sorry that I (hurt) __________ him.

5/ After they (go) __________ , I (sit) __________ down and (rest) __________.

6/ When I (arrive)___________, the dinner (already, begin) ______________.

7/ My friend (not see) _______ me for many years when I (meet) _____ last week.

8/ He (learn) __________ English before he (leave) __________ for England.

9/ In England, he soon (remember) __________ all he (learn) __________.

10/ They (tell) __________ him they (not meet) __________ him before.

11/ He (ask) __________ why we (come) __________ so early.

12/ She (say) __________ that she (already, see) ___________ Dr. Rice.

13/ By the time Bill (get) __________ there, the meeting (start) __________.

14/ When we (arrive) __________ at our place, we (find) __________ that a burglar (break) ____________ in.

15/ Almost everybody (leave) _______ for home by the time we (arrive) _______.