Last month, the Japanese government expressed their thanks for the air they_______ from China.

By the time Jack returned home from England, his son.      from college.

I'll go to the library as soon as I finish what I             

In the near future more advances in the robot technology ______ by scientists.
　　A are making    B in made        C will make     D will be make

It is the most instructive lecture that ________since I came to this school.
　　A attended           B had attended       C am attending   D have attended

In 1492, Columbus_______ on one of the Bahama Islands, but he mistook it for an island of India.
　　A lands          B landed         C has landed        D had landed

--- Joan, what_________in your hand?
　　--- Look! It's a birthday gift for my grandmother.

——Tommy is plannning to buy a car.
——I know. By next month, he ___enough for a used one.

.——I hear you___in a pub. What’s it like?
——Well, it’s very hard work and I’m always tired, but I don’t mind.

—I’m sure Andrew will win the first prize in the final.
—I think so. He _____ for it for months.