.It’s about a time _____ there were black slaves in North America.
| A．where | B．when | C．how | D．that |
What he had said about the incident and done with it _________ our trouble.
| A．added up to | B．added to | C．added up | D．were added to |
I was afraid Mr. Lu would not accept my advice at the beginning. _______, he was quite pleased with it.
| A．As a matter | B．As the matter of fact |
| C．As a fact | D． As a matter of fact |
--- He has been playing computer games these weeks.
--- It’s no ______ he didn’t do well in the test this time.
| A．wonder | B．matter | C．surprise | D．problem |
The number of people invited to the party ______ fifty, but a number of them _____ absent.
| A．were, was | B．was, were | C．was, was | D．were, were |
He has made progress in his English, _______ makes his father very happy.
| A．who | B．that | C．what | D．which |