To stay safe in the forest at night, we should try hard to keep the fire _______.
| A．burning | B．burnt |
| C．to be burning | D．being burnt |
The train was crowded and I had to get into a carriage _______ there were already seven other passengers.
| A．which | B．where | C．what | D．when |
_______you write on a subject,you join in an ongoing, trans-historical conversation with others who have written about your topic.
| A．No matter what | B．Wherever |
| C．Whenever | D．No matter how |
What they are arguing over the meeting is _______ they should invest so much money in that time-consuming project, as they worry about the losing money.
| A．what | B．that | C．whether | D．how |
These reference books donated by a non-profitable organization are available for _______ wants to have it.
| A．anyone | B．whomever | C．who | D．whoever |
It was thirty years _______ he was invested as an outstanding alumnus to celebrate the 128th anniversary of the university.
| A．as | B．while | C．before | D．until |