John waited at the bus-stop for nearly half an hour _____ the bus finally arrived .
| A．when | B．as | C．before | D．while |
.
This was the call _________announced there was about to be a whale hunt.
| A．it | B．that | C．this | D．one |
.
I looked down into the river and could see Old Tom _____ by the boat.
| A．swims | B．swam | C．to swim | D．swimming |
.
He had opened the curtains that night _______the other women would see him and Claire.
| A．in case | B．even though | C．so that | D．unless |
.
My tutor explained that I ________read lots of different texts that contain different opinions.
| A．should | B．must | C．shall | D．will |
.
Tombe told me that the can___________ to dry out the leftover food.
| A．is heating | B．heat | C．heated | D．was heate |