I’m not a teacher in this school．I _____ until a new teacher arrives．
| A．am just helping out | B．could just help out |
| C．just help out | D．have just helped out |
Listen! Someone__________ in the next room.
| A．cry | B．is crying | C．are crying | D．crying |
There__________a table with three legs in Jenny’s room.
| A．is | B．are | C．has | D．have |
Neither of them__________a worker.
| A．am | B．are | C．is | D．were |
Our knowledge of computers__________growing all the time.
| A．be | B．is | C．are | D．were |
There__________sheep in the field.
| A．are much | B．is small |
| C．is a few | D．is a little |