___ poor at English, I'm afraid I can't make myself ___.
| A．To be; understand | B． I'm ; to understand |
| C．Being; understanding | D．Being; understood |
Two kilograms ______ too heavy for a sick man.
| A．is | B．are | C．was | D．were |
A group of children ______ hide and seek in the garden.
| A．is playing | B．are playing | C．has been playing | D．was playing |
All but one ______ here just now.
| A．is | B．was | C．have been | D．were |
The police ______ for the lost child everywhere.
| A．is looking | B．has looked | C．are looking | D．are looked |
Both bread and butter ______ on sale in this shop.
| A．is | B．are | C．have | D．has |