Откройте скобки. используйте прошлые простые или настоящие совершенные времена.
1. he (to give) his first lecture in banking in 2002. he (to become) a brilliant lecturer since.

2. we first (to observe) this effect in 2008. we (to make) good progress in studying it since.

3. i (to come) to work at this university in 2006. i (to publish) eight papers since.

4. some years ago my friend (to read) a book on the history of economics. he (to be) interested in studying economics since.

1)who was at the zoo?

2) they were at school

джон взял свою собаку на прогулку утром

can you sing? yes i can, but i can't draw.

can he dance? no, he can't, but he can roller-skate.

can she draw? yes, she can, but she can't ride a bike.

can they ride a bike? yes, they can, but they can't roller-skate.

i spent most of the winter holidays in the city. i had planned to have a good rest, relax. i managed to do everything i had planned. there was a new year party in our school. it was very well organized and i enjoyed it.i think it is a kind and fairy holiday. people forgive each other, exchanges presents and good wishes. this new year's day i celebrated as always with my family at home. long before the holiday we had decorated the rooms and a fir tree. on the new year's day i helped my mother with cooking. every year we make a big cake. it is our family tradition. at midnight some people went outside and set off fireworks. it was so wonderful that it took my breath away.