We ________ our breakfast when an old man came to the door. a. just have had b. have just had c. just had d . had just had He ________ when the bus came to a sudden stop. a . was almost hurt b. was hurt himself c . was to hurt himself d. was hurting himself The tree looked as if it _______ for a long time. a. hasn’t watered b. didn’t water c . hadn’t been watered d. wasn’t watered The grey building is where the workers live, and the white one is where the spare parts _______ . a. are producing b . are produced c. produced d. being produced The fifth generation computers, with artificial intelligence, _______ and perfected now. a. developed b. have developed c . are being developed d. will have been developed Great as Newton was, many of his ideas ______ today and are being modified by the work of scientists of our time. a. are to challenge b. may be challenged c . have been challenged d. are challenging It seems oil ________ from this pipe for some time. We’ll have to take the machine apart to put it right. a. had leaked b. is leaking c. leaked d . has been leaking If you smoke in a non-smoking section people ________. a. have objected b. objected c. must object d . will object By the end of this month, we surely ______ a satisfactory solution to the problem. a. have found b. will be finding c . will have found d. are finding Turn on the television or open a magazine and you ______ advertisements showing happy, balanced families. a. are often seeing b. often see c . will often see d. have often seen A. dacbccddcc