She has a gift for creating an atmosphere for her students ____allows them to communicate freely with each other.
| A．which | B．where | C．what | D．who |
Last term our maths teacher set so difficult an examination problem ______none of us worked out.
| A．that | B．as | C．so that | D．which |
His grandfather was among the first to settle in_______ is now a famous holiday center.
| A．which | B．what | C．where | D．that |
E-mail, as well as telephones, an important part in daily communication.
| A．is playing | B．have played | C．was playing | D．play |
Though ________ money, his parents managed to send him to university.
| A．lacked | B．lacking of | C．lacking | D．lacked in |
The doctor recommend he _________ a few more days in hospital.
| A．stays. | B．to stay | C．stay | D．would stay |