To make the students understand the problem the teacher tried to explain it, but the explanation just did not _________to the class．
| A．get through | B．get around | C．get down | D．get across |
Obviously he had set up a situation _____ he didn’t have to blame, or even recognize, his own shyness.
| A．where | B．which | C．that | D．Whom |
______ she began reading and saw what fun it was, there was no stopping her.
| A．Unless | B．Once | C．Until | D．Though |
We recommend you ______ at least 15 minutes before the start of your tour.
| A．arrive | B．arrived |
| C．will arrive | D．have arrived |
I also felt guilty, as all fathers do at a time like this, wondering whether there was anything I ______ to have prevented this situation from rising.
| A．would do | B．could do |
| C．can do | D．could have done |
Children are not born with their habits already _______.
| A．to make | B．to be made | C．making | D．Made |