A dark cloud is a ________ of thunderstorm.
| A．symbol | B．sign | C．mark | D．signal |
It ____I who _____leaving for London.
| A．is…is | B．am…is | C．is…am | D．am…am |
“You” _____ a very useful word in English.
| A．are | B．is | C．has | D．become |
_____ were nice to me when I was in the United States.
| A．The Brown’s | B．Brown’s | C．The Browns | D．Browns |
The population of city________ larger than that of any other city in the country.
| A．is | B．are | C．has | D．have |
Nothing except some chairs _____ there.
| A．was | B．were | C．has | D．had |