The first textbooks ________ for teaching English as a foreign language came out in the 16th century.

[　　]

The computer centre, ________ last year, is very popular among the students in this school.

[　　]

Most of the people ________ to the party were famous scientists.

[　　]

Prices of daily goods ________ through a computer can be lower than store prices.

[　　]

--My uncle comes in from lran tonight.

--How long has it been ________ you last saw him?

[　　]

--Take a cigarette, please.

--No, thanks. It's three years ________ I smoked.

[　　]

________ you have seen both fighters, ________ will win?

[　　]

A. Since; do you think who

B. As; who you think

C. When; whoever

D. Since; who do you think

--what was the party like?

--Wonderful. It's years ________ I enjoyed myself so much.

[　　]

This bookcase ________ when we were moving.

[　　]

The fifth generation computers, with artificial intelligence. ________ and perfected now.

[　　]

A. developed

B. have developed

C. are being developed

D. will have been developed