Jack, try to learn some relaxation exercises and do them ______ you feel stressed.
| A．for every time | B．every time | C．by the time | D．some time |
According to Xi, common values held by Chinese people of all ethnic groups are ________ for the country's future and its people's well-being.
| A．affectionate | B．responsible | C．reliable | D．essential |
We were delayed at the train station．Otherwise，we here by lunch．
| A．must have been | B．could be |
| C．should be | D．would have been |
The teaching building, to be environmentally friendly, will be completed next year.
| A．designed | B．designing |
| C．being designed | D．having designed |
The president stressed that young people's values determine the values of the future society, and more efforts should be made to ensure young people's cultivation of sound value systems, ________ are still in the formation stage.
| A．which | B．what | C．when | D．where |
—The tickets for the concert have been sold out.
—Thanks for reminding me, but I am lucky to have got .
| A．another | B．it | C．that | D．one |