. The glass doors have taken the place of the wooden ones at the entrance, __________ in the natural light during the day.
| A．to let | B．letting |
| C．let | D．having let |
.After they were given several terrible blows, the enemy did not _____ out after dark.
| A．dared to come | B．dared come | C．dare to come | D．dare coming |
I thought it a pity __________ him to the tea party.
| A．being not invited | B．not to have invited |
| C．to not have invited | D．not to have been invited |
.A reward of 1,000 dollars will be given ________ can find the lost child.
| A．whomever | B．whoever that | C．to whomever | D．to whoever |
.So often ______ in recent years that it has almost become a rule.
| A．has this happened | B．this has happened |
| C．is this happening | D．for this to happen |
.The farmer who admitted ______ the tiger was severely punished.
| A．to kill | B．killing | C．killed | D．to have killed |