The big fire in Shanghai, believed to ______ due to the burning of construction materials, caused 58 deaths and destroyed all the belongings of the people there.
| A．have occurred | B．occur |
| C．have been occurring | D．be occurring |
Would you tell me ____ way I should take?
| A．what | B．that | C．which | D．whose |
ou can't wear a blue jacket _____ that shirt — it'll look terrible.
| A．on | B．above | C．up | D．over |
It is quite clear ____ he won't see us.
| A．what | B．that | C．why | D．how |
1 feel that one of my main duties ______ a teacher is to help the students to become better learners.
| A．for | B．by | C．as | D．with |
___ he did it remains a secret.
| A．What | B．Whom | C．Which | D．How |