Our school had about 20 notebook computers but only one-forth_____used regularly. Now we have 50 working all day long.
| A．is | B．are | C．was | D．were |
It's not necessary to explain the truth________there are air，water and sunlight，there are living things.
| A．in wherever |
| B．that wherever |
| C．which |
| D．that |
Tomorrow is Tom's birthday. Have you got any idea________the party is to be held?
| A．what |
| B．which |
| C．that |
| D．where |
Along with the letter was his promise________he would visit me this coming Christmas.
| A．which |
| B．that |
| C．what |
| D．whether |
Word has come________in some western countries demand for graduates from NBA.
A．that
B．while
C．when
D．as
Danby left word with my secretary________he would call again in the afternoon.
| A．who |
| B．that |
| C．as |
| D．which |