---You may find the key to the maths problem on page 107.
---Ah, it’s so simple. I wonder why I ________ of that.
| A．didn’t think | B．haven’t thought | C．wasn’t thinking | D．hadn’t thought |
The exhibition he had been looking forward to _________ was _________ until next Sunday.
| A．visit; put off | B．visiting; put off |
| C．visit; put on | D．visiting; put on |
–The last one _________ pays the meal.
– Deal!
| A．arrived | B．arrives | C．to arrive | D．arriving |
Here are the first three books of his poem works, with the fourth one to _________ next month.
| A．publish | B．come out | C．turn out | D．replace |
__________ you are old enough to judge things, you should decide your path in life.
| A．Since | B．In order that | C．Though | D．Unless |
In __________ it’s not shocking to see students in __________ on college campus.
| A．1990s; sixties | B．the 1990s; their sixties |
| C．the 1990s; the sixties | D．1990s; their sixties |