.
I have many friends, _______ some are businessmen.
| A．of them | B．from which | C．of who | D．of whom |
According to common practice, the president _________ hold office for five years.
| A．must | B．shall | C．need | D．will |
Will you help me out with this mathematical problem? I ____ it.
| A．am going for | B．am stuck with | C．am blamed for | D．am caring for |
The 2014 FIFA World Cup will be held in Brazil on June 13th, 2014, and 32 football teams_____ so far.
| A．will choose | B．have chosen |
| C．have been chosen | D．will be chosen |
---Did Tom come back late last night?
---No. It was not yet 8 o’clock ____ he arrived home.
| A．before | B．when | C．that | D．until |
Our school has about 100 computers, but only sixty percent ____ used regularly.
| A．is | B．are | C．was | D．were |