Tony can't have received the invitation. _________，he would have attended your birthday party yesterday.
| A．Therefore | B．Otherwise |
| C．However | D．Besides |
Measures have been taken to fight ________recurring food safety problems, but there is still a long way to go before China can rid itself ________ these issues.
| A．for; of | B．for; from | C．against; of | D．against; from |
“Only two centimeters higher, _______break the world record,” encouraged the coach.
| A．you will | B．and you will | C．or you will | D．will you |
This nationwide smog should serve as a reminder to all, indicating a high time that we ______ on what we've done to the environment.
| A．have reflected | B．are reflecting | C．will reflect | D．reflected |
The Chinese abacus(算盘), officially ______ as a cultural heritage at the 8th Annual UNESCO World Heritage Congress, is another symbol of Chinese wisdom.
| A．having listed | B．listed | C．having been listed | D．listing |
— Tom seems not so enthusiastic as he was two years ago.
— Yes. He’s really reached a point in his career ______ he has to decide what to do next.
| A．that | B．when | C．where | D．which |