20．-Do you mind it I keep pets in this building?

-________.

A．I’d rather you didn’t, actually　 　　　　　 B．Of course not. It’s not allowed here

C．Great! love pets　　　　　　 　　　　　　 D．No, you can’t

19．Although he had a disease of the brain which ______, he decided to continue _____ his research and his writing.

A．was getting worse; with　　 　　　　　　　　 B．got bad; for　 　

C．is getting bad; to　 　　　　　　　　　　　　　　 D．get worse; at

18．-Will $200 ______ the cost of the damage?

-I’m afraid not. I need at least 100 ______ dollars.

A．cover; another　　 B．include; more　　　 C．afford; else　　　　　 D．cover; more

17．The medical treatment is developing fast in the countryside. In many villages there is _____ one clinic today.

A．no more than 　　 B．at most　　 　　　 C．less than 　 　　　 D．at least