The plan for the new design occurred to Mr. Smith______on his work recently.
| A．while concentrated | B．while concentrating |
| C．while he concentrated | D．while concentrating himself |
his knowledge of the mountainous village, John was appointed as our guide.
| A．In spite of | B．On account of |
| C．Regardless of | D．Instead of |
—What’s our feeling now?
—I am terribly sorry. If only I here yesterday!
| A．come | B．would have come |
| C．have come | D．had come |
Sorry, I am too busy now. If I time, I would certainly go for an outing with you.
| A．have had | B．had had | C．have | D．had |
When Peter speaks in public, he always has trouble the right things to say.
| A．thinking of | B．to think of |
| C．thought of | D．think of |
Lost in the mountains for three days, what the three men were able to do was the help of helicopters.
| A．expected | B．expect |
| C．being expected | D．to be expected |