Does Liu Hui serve in the army? —No, but he ________ in the army for three years

It was desired that the project ______ before the end of this month.

There is still a long way to go to solve all the problems ______ conservation of natural resources.[ ]

People with high EQs are less _____ to be troubled by problems and have positive attitudes towards life.[ ]

We can relax ourselves by taking part in school activities after long hours’ study; _______, wecan learn a great deal from other students