Вопрос по английскому языку:

Дорогие мои помогите пожалуйста
Задание: Напишите предложения,используя Past Simple or Present Perfect.
1.We already ... the Zoological Society of London. (join)
2.Our class ... to the Zoo yesterday. (go)
3. Last year my family ... to the Black Sea. (go)
4.She just ... from Italy. (return) She ... there last year. (go)
5.Yesterday they ... a party. (have)
6. Last week we ... a composition. (write)
7.I ... to Boston yet. (not be)
8.The pupils ... the new rule last Monday. (not understand)
9.Kate and Jess ... a nice cat recently. (buy)
10.Two days ago my friend and I...an UFO. (see)