--- How come your father can read books in German?
--- Well, he____on a project with some German engineers for 3 years when he was young.
| A．worked | B．was working | C．had worked | D．would work |
Many people claim that they have seen UFO with their own eyes, _____ I personally doubt.
| A．that | B．which | C．when | D．where |
—You _____ a meal this evening. I had dinner at a restaurant with Tom.
—Well, why didn’t you phone me and let me know?
| A．should not cook | B．don’t need to cook |
| C．needn’t have cooked | D．should have cooked |
Water, which seems so simple and common, is _____ makes life possible.
| A．that | B．what | C．which | D．how |
_____ she heard the news that she won a scholarship, she was very excited.
| A．The moment | B．At the moment | C．For the moment | D．A moment |
American President Obama, together with some members of his government, _____ going to visit China next month.
| A．is | B．are | C．were | D．was |