13．There is no love, no friendship, like______of the parents for their child.
| A．that | B．those | C．the one | D．the ones |
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 |
—Why didn’t you remind him of the possible danger?
—But what _______ otherwise? He never listens to me.
| A．could I do | B．could I have done | C．should I do | D．must I have done |
The new means of transport ________ in this city, so whether it will work out remains to be seen.
| A．have never tried | B．has never tried | C．have never been tried | D．has never been tried |
It wasn’t until then _______ their marriage was breaking up because they had little in common.
| A．did I realize | B．that I realized | C．had I realize | D．when I realized |