John ______ in his room when he heard screaming.
| A．is studying | B．studied | C．was studying | D．has studied |
The secretary and principal ________ at the meeting now.
| A．are speaking | B．is speaking |
| C．were making a speech | D．have a speech |
Thirty dollars ________ too expensive.
| A．are | B．is | C．were | D．be |
The number of pages in this dictionary ________ about two thousand.
| A．are | B．has | C．have | D．is |
Now Tom with his classmates ________ football on the playground.
| A．play | B．are playing | C．plays | D．is playing |
Half of the workers here ________ under 30 ________.
| A．is;years | B．are;year old | C．is;years old | D．are;years of age |