We ________ the bridge for over two years and it will be half a year before it’s completed.
| A．are building | B．have built |
| C．have been built | D．have been building |
–Could I borrow your computer?
--_______.
| A．Help yourself. | B．Make yourself at home | C．By all means. | D．Never mind. |
It’s quite obvious that the aging population in China will cause _____heavy pressure on _____whole society in the future.
| A．/, the | B．the, / | C．a, the | D．a, a |
—Next Monday is my birthday.
—Is that so? ________
| A．I can’t believe my ears. | B．I’m so glad to hear that. | C．What presents do you want? | D．Many happy returns of the day! |
On July 1st, 1921, the red boat on South Lake in Jiaxing ________ the birth of the Communist Party of China,
which marked a new start for Chinese people.
| A．witnessed | B．gave | C．experienced | D．founded |
Scientists have discovered amazing evidence showing how the human body rebuilds _______ while we sleep.
| A．us | B．ourselves | C．it | D．itself |