This is the second time I ________ the Himalayas as a college student.[ ]

I didn’t see your sister at the party. If she __, she would have met my brother.

ory of Li Tianyi, the son of ________famous military singer, driving a BMW without a license and attacking a coupleon the road has drawn the attention of ________ public

It is recommended that the project________until all the preparations have been made.[ ]

The scientists all over the world are trying their best to develop _____ energy, such as sunlight, wind and water for power and fuel. [ ]