16．After driving for 20 miles, Jackson realized that he______in the wrong direction.
| A．was driving | B．drove | C．had been driving | D．had driven |
31．_____Tom has no interest in piano, there is no point pushing him to learn it．
| A．Now that | B．In case | C．Even if | D．As if |
30．—Peter looked tired and a little absent-minded at the meeting．
—He _____ up too late．
| A．may stay | B．could stay |
| C．should have stayed | D．must have stayed |
29．His humorous closing speech was a welcome addition to the ______dull meeting．
| A．therefore | B．meanwhile | C．otherwise | D．Thus |
28．The government had hoped to draw as much attention as possible to this problem but it didn't ______ that way．
| A．work out | B．give out | C．go out | D．pick out |
27．The students wonder______ good the course will do to their future jobs．
| A．which | B．what | C．whether | D．Why |