The computer in 1946 in America.
| A．is invented | B．was invented | C．invents | D．invented |
—You praise your son. He works harder than before.
—Thanks, I will.
| A．should | B．can | C．may | D．must |
Our team tried our best, we failed the match at last.
| A．but | B．and | C．or | D．while |
the morning of March 31, she made an important decision in her life.
| A．Since | B．In | C．From | D．On |
— I’m afraid I can’t you, sir. Can you speak more slowly?
— Of course.
| A．follow | B．listen | C．see | D．find |