What’s your plan for this winter vacation?—I’ll take an express train to Dalian for my holiday ______ school ends[ ]

All the employees at the company are _______ their business as usual.

The USA and some other countries helped the rebels in Libya ______ their promise to support democracy and fair trade

However,the incident was the only spark_____the fire.

The pilot,(飞行员) whether ______ or on purpose, made the plane do a sharp turn.(急转弯)