The doctor could ______ by the symptom that the patient caught flu.
| A．observe | B．say | C．tell | D．speak |
17. It’s a pity that you________leave so soon. It’s been so nice having you here.
| A．should | B．could | C．can | D．Might |
16. — Where is your new home now?
—In the new developed zone. But I_____downtown for five years.
| A．have lived | B．had lived | C．lived | D．was living |
15. Poverty is still killing people._____, these small victories are a good start towards a better future.
| A．Furthermore | B．Therefore | C．However | D．Otherwise |
14. —I’m very busy now. Could I call you back after work?
— OK. I’ll wait for you.
| A．Probably | B．Occasionally | C．Frequently | D．Actually |
13. —Hi, Johnson, any idea where Susan is ?
—It’s class time, so she________in the classroom now.
| A．can be | B．must have been | C．might have been | D．must be |