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His aunt’s letters ________ him of those beautiful days when they used to live together in his hometown.

A. call up　　　　B. call for　　　　C. call on　　　　D. call at

Yesterday I tried to call you several times but I couldn’t __________ to you.

A. call up　

B. ring up　

C. get through

D. go through

The American friend is staying at a hotel. Let’s go and _____ the hotel.

　 A. call on 　 B. call for

　 C. call up 　 D. call at

If you find a poisoned person who has stopped breathing, clear the airway and try to get him

　　   , next, 　　   an ambulance at once.

A. breathe; call for　　　　　　　　　　　　    B. breathing; call on

C. breathe; call up　　　　　　　　　　　　　　 D. to breathe; call for

　　   , next, 　　   an ambulance at once.

A. breathe; call for　　　　　　　　　　　　    B. breathing; call on

C. breathe; call up　　　　　　　　　　　　　　 D. to breathe; call for