The retired workers were invited to the company， ________surprise，changes had been so great over the years.
| A．whose | B．who | C．to whom | D．to whose |
When I got back home, I saw a message pinned to the door“ Sorry to miss you, I will call later.”
| A．read | B．reads | C．to read | D．reading |
Present at the meeting ．
| A．Mr. Liu was, who taught us English |
| B．was Mr. Liu, who taught us English |
| C．was who taught us English, Mr. Liu |
| D．Mr. Liu, who taught us English, was |
Scientists are convinced _____ the positive effect of laughter _____ physical and mental health．
| A．of; on | B．by; in | C．of; at | D．on; at |
What would have happened, as far as the river bank?
| A．Bob had walked farther | B．if Bob should walk farther |
| C．if Bob walked farther | D．had Bob walked farther |
Rather than on a crowded bus, he always prefers a bicycle．
| A．ride; ride | B．riding; ride | C．ride; to ride | D．to ride; riding |