According to the air traffic rules, you ___ switch off your mobile phone before boarding.
| A．may | B．can | C．would | D．should |
Why are you doing that? If I ____you, I’d stop.
| A．had been | B．hadn’t been | C．were | D．were not |
Mr. Black was old, but able to _______quickly to changes in technology.
| A．reply | B．apply | C．contribute | D．respond |
When I met Becky, she told me that she ______ for an interview the next day.
| A．would go | B．has gone | C．went | D．had gone |
Many high school students wish that they ______ at a top university in the future.
| A．had studied | B．studied | C．have studied | D．could study |
When I was in primary school, I was told that the earth ______around the sun.
| A．had travelled | B．would travel | C．travels | D．travelled |