| A．a | B．an | C．the | D．／ |
On TV we can see elephants, m1．, dogs, bears or other animals doing a lot of things for us. For example, elephants can carry things, dogs can look a2． houses and lead blind people to cross streets. If we watch more c3．, we can find those animals always get a little food to eat after they have done something. So scientists say many d4． animals may learn to do more easy w5． for us if they know they will get something to eat.
| A．sister | B．aunt | C．cousin | D．brother |
| A．asks；to |
| B．asks；as |
| C．asking； about |
| D．asking； to |
| A．to come to, I'd like to |
| B．coming, I'd like to |
| C．to come, I do |
| D．coming, I do |
| A．do, as, I'd like |
| B．would, as, I'd like |
| C．do, for, I'd like to |
| D．would, as, I'd like to |
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