Mary speaks in a low voice; ____ is difficult to know what she is saying.
| A．it | B．that | C．so | D．she |
This pair of trouseis ____ too long for him.
| A．is | B．be | C．are | D．were |
Your trousers____ dirty.You must have____ washed.
| A．is;il | B．are;it | C．are;them | D．is;them |
The police ____ the murderer everywhere when he suddenly appeared in a theatre.
| A．is searching for | B．were searching for |
| C．are searching for | D．were searching |
"All____ present and all____ going on well," our monitor said.
| A．is;is | B．are;are | C．are;is | D．is;are |
Many a man ____ come to help us.
| A．have | B．has | C．is | D．are |