We lost our way in that small village, otherwise we __________ more places of interest yesterday.
| A．visited |
| B．had visited |
| C．would visit |
| D．would have visited |
Mary as well as her sisters ____ Chinese in China.
| A．are studying | B．have studied | C．studies | D．study |
Neither Tom nor Jack and I ____ his students.
| A．are | B．am | C．is | D．was |
The rich ____ not always happy.
| A．are | B．is | C．has | D．have |
I, who____ your friend, will try my best to help you with your English.
| A．am | B．is | C．are | D．be |
The United States of America _____one of the most developed countries in the world.
| A．is | B．are | C．was | D．were |