Only when he put his foot into the river________that the water was too cold to swim in.
| A．he realized | B．did he realize |
| C．had he realized | D．he had realized |
The scientists were waiting to see the problem _____.
| A．settle | B．to settle | C．settled | D．settling |
—Good morning. Can I help you?
—I’d like to have this package _____, madam.
| A．be weighed | B．to be weighed | C．to weigh | D．weighed |
The next morning she found the man _____ in bed, dead.
| A．lying | B．lie | C．lay | D．laying |
If a story is _____, you’ll become _____ when you read it.
| A．exciting; excited | B．exciting; exciting |
| C．excited; excited | D．excited; exciting |
Many things _____ impossible in the past are common today.
| A．considered | B．to consider | C．considering | D．being considered |