The teacher that his students had difficulty in English grammar, decided to give them more examples.
| A．knows | B．to know | C．knowing | D．being known |
Is this the young engineer ________ you want to have ________ the computer for me?
| A．who, repaired | B．that, repairing |
| C．who, to repair | D．that, repair |
-----They used to be good friends, but now they are like strangers. ----- How _____ this ______?
| A．were; come about | B．did; come about |
| C．were; taken place | D．were; happened |
This new-type machine____________ little room.
| A．takes up | B．is taken up | C．has been taken up | D．is taking up |
The cattle _______ grazing on the grass.
| A．were | B．was | C．be | D．is |
Such a problem is＿＿＿＿difficult for a primary school student ＿＿＿.
| A．so； to work | B．very too； to work out |
| C．rather too； to work out | D．quite too； to answer |