— Did you return the book to me? Why can’t I find it anywhere?
— ________. You were writing a letter at your desk at that time.
| A．I will give it to you | B．I did give it to you |
| C．I had given it to you | D．I do give it to you |
________ for several weeks，the city needed food.
| A．As having flooded | B．Being flooded |
| C．Having been flooded | D．To flood |
I went to see him，________ him out.
| A．finding | B．find |
| C．only to find | D．to finding |
Volunteering gives you a chance ________ lives, including your own.
| A．change | B．changing | C．changed | D．to change |
________ basic first－aid techniques will help you respond quickly to emergencies.
| A．Known | B．Having known |
| C．Knowing | D．Being known |
________at the cafeteria before，Tina didn't want to eat there again.
| A．Having eaten | B．To eat |
| C．Eat | D．Eating |