When _____ about the secret of his success, Steven gave us a smile and said nothing .
| A．asking | B．having asked | C．ask | D．asked |
Studies show that people are more_______to suffer from back problems if they always sit before computer screens for long hours.
| A．likely | B．possible | C．probable | D．sure |
______ in my life impressed me so deeply as my first visit to the Palace Museum.
| A．Anything | B．Nothing | C．Everything | D．Something |
We _______ on this project for four hours. Let’s have a rest.
| A．are working | B．have been working | C．worked | D．had worked |
What the doctor really doubt is_____my mother will revover from the serious disease soon.
| A．when | B．how | C．whether | D．why |
Her name was on the _______of my tongue, but I couldn’t tell it.
| A．point | B．edge | C．top | D．tip |