_______to reach them on the phone, we sent an email instead.
| A．Fail | B．Failed | C．To fail | D．Having failed |
____ he had not hurt his leg, John would have won the race.
| A．If | B．Since | C．Though | D．When |
We all know that, __________, the situation will get worse.
| A．not if dealt carefully with | B．if not carefully dealt with |
| C．if dealt not carefully with | D．not if carefully dealt with |
---The last one __________________ pays the meal. ---Agreed!
| A．arrived | B．arrives | C．to arrive | D．arriving |
Some pre-school children go to a day care center, _____ they learn simple games and songs.
| A．then | B．there | C．while | D．where |
．The news came as no surprise to me. I ______ for some time that I would fail in the exam.
| A．had known | B．knew | C．have known | D．know |