He began to take political science _________ only when he left school.
| A．strictly | B．truly | C．carefully | D．seriously |
So sudden_____ that the enemy had no time to escape．
| A．did the attack | B．the attack did |
| C．was the attack | D．the attack was |
—Why．Jack, you look so tired!
—Well．Ithe house and I must finish the work tomorrow．
| A．was painting | B．will be painting |
| C．have painted | D．have been painting |
To learn English well, we should find opportunities to hear Englishas much as we can．
| A．speak | B．speaking |
| C．spoken | D．to speak |
After the fierce competition, the students were taken to their camp, _____ they would rest for next round．
| A．where | B．who | C．which | D．what |
It was never clear _____ the man hadn't reported the accident sooner．
| A．that | B．what | C．when | D．why |