6. “I don’t expect Ann’s husband to be here at the opera with her.”
“I’m surprised, too. Ann _____ insisted that he come with her.”
A. would have
B. must have
C. should have
D. can have
7. It _____ a long time before any landing on Mars can be attempted.
A. takes
B. has taken
C. will be
D. would be
8. Frogs and newts are _____.
A. fauna
B. insects
C. amphibians
D. mammals