1) Is the house comfortable for us _____ ? 
　　 A) to live
　　 B) to be living
　　 C) living
　　 D) to live in

　2) The idea is difficult _____ in English. 
　　 A) to be expressed
　　 B) to express
　　 C) express it
　　 D) to express it

　3) Apples are cheap _____ when they are in season. 
　　 A) to buy
　　 B) to be bought
　　 C) to buy them
　　 D) buy them

　4) She is never afraid _____ out at night. 
　　 A) going
　　 B) to be going
　　 C) to go
　　 D) to have gone

　5) I am fortunate _____ good health. 
　　 A) to have
　　 B) to be having
　　 C) have
　　 D) to be