This cake is very sweet. You _____ a lot of sugar in it.
| A．should put | B．could have put | C．might put | D．must have put |
All the characteristics that distinguish birds ________ other animals can be traced to prehistoric times..
| A．to | B．between | C．for | D．from |
Mother made a promise ________ I passed the exam, she would buy m e a computer..
| A．if | B．that | C．that if | D．whether |
He tried his best, but he couldn’t ________ the college entrance exams last year.
| A．get through | B．get over | C．get up | D．get away |
Because of my poor English I’m afraid I can’t make myself ____．
| A．understand | B．to understand | C．understanding | D．understood |
I really appreciate that your help is of great _________.
| A．useful | B．value | C．important | D．worth |