The students have been working hard on their lessons and their efforts （ ） with success in the end.
（A）rewarded
（B）were rewarded
（C）will reward
（D）will be rewarded
When I went out jogging early this morning, I found the ground wet. It （ ） last night.
（A）might have rained
（B）may have rained
（C）can have rained
（D）must have rained
Why are your eyes so red? You （ ） have slept well last night.
（A）can't
（B）mustn't
（C）needn't
（D）won't
