12. Your friend acts ______ he were a trustworthy person but as a matter of fact he seldom keeps_____. So remember not to trust him with anything important.
A. as if; his words B. as though; his word
B. even if; his promise D. even though; his promises
―They decide to take _____ sail around the island.
―When will the ship set _____ sail?
| A．a; / | B．/; a |
| C．a; the | D．the; / |
______ at the airport, he telephoned his wife and bold her what he would do when he got home.
| A．Once arrived | B．As soon as he reached |
| C．When he got | D．Upon arriving |
By the time Einstein was 14 years old, he ________ himself advanced mathematics.
| A．has taught | B．taught |
| C．had taught | D．was teaching |
What you said just now has ______ the matter we are discussing. Let’s come to the point.
| A．something to do about | B．nothing to do about |
| C．something to do with | D．nothing to do with |
—Got your driving license?
—No. I ____ too busy to have enough practice, so I didn’t take the driving test last week.
| A．was | B．am |
| C．have been | D．had been |