. —He is eager to try something he has never tried before.
—Oh, I see. That’s _______ he’s different from others.
| A．when | B．what | C．how | D．where |
Nobody could______it when the bull broke into the shop and attacked two customers with its horns. The others just hurried away from it.
| A．make | B．help | C．aid | D．assist |
He appears ______ a long time. He is impatient for my arrival.
| A．to wait | B．to be waiting | C．to have waited | D．to have been waiting |
Every device ______in the plane must be designed and made with great care so as to make sure that nothing goes wrong in operation.
| A．fitted | B．to be fitted | C．fitting | D．being fitted |
He left home early only______he was late as he went a wrong way.
| A．found | B．to find | C．finding | D．being found |
— Beijing or Shanghai? What did you mean?
— We were talking about _______ go to college.
| A．how to | B．where to | C．whether to | D．when to |