1. By the first decade of the 21st century, international commercial traffic vastly beyond today’s levels.

　　A.will be expected to extend B. will have been expected to extend

　　C.is expected to be extended D. is expected to have extended

　　2. We advocate the economic, cultural and religious traditions of all national minorities.

　　A. to respect B. to be respected

　　C. respecting D. having respected

　　3. There are two horses at the ends of a rope with all their might in opposite directions.

　　A. pulling B. pull C. pulled D. to pull

　　4. Today the Tennessee Valley is one of the richest areas in the world. But if things as they were it would now be a desert.

　　A. had left B. were left C. had been left D. had been leaving

　　5.After twenty years abroad, William came back only how his hometown was damaged in an earthquake.

　　A. to find out B. finding out

　　C. to have found outD. to be finding out

　　1. D句子講的是 “人們期待到21世紀(jì)前10年時(shí),國際性商業(yè)航空交通遠(yuǎn)遠(yuǎn)超過當(dāng)今水平”, 人們現(xiàn)在就期待, 而不是將來期待, 所以A、B是錯(cuò)誤的; 另外, 表示到將來某一時(shí)刻為止已經(jīng)完成的動(dòng)作或出現(xiàn)的狀態(tài), 應(yīng)用將來完成時(shí), 按句意, 是指extend這一動(dòng)作的完成, 所以應(yīng)該在不定式上體現(xiàn)出來。根據(jù)上述分析, 選D符合句意要求。

　　2. C動(dòng)詞advocate后接動(dòng)名詞而不接不定式做賓語。D雖然是動(dòng)名詞, 但用其完成式在語義上講不通。

　　3. Apulling是現(xiàn)在分詞在句中做horses的定語, 相當(dāng)于which pull。

　　4. Chad been left表示與過去事實(shí)相反的假設(shè) “如果情況還像以前那樣”。

　　5. A不定式to find out做結(jié)果狀語,有意想不到的含義。不定式表示結(jié)果時(shí), 用其一般式即可。