He made a promise _____ he would treat me to dinner if I helped him with his housework,______ made me very excited.
12.It took us over an hour_______along the street.
13.I think it a great honour_______to visit your country.
14.Many people now make_________a rule to buy cards for their friends before Christmas.
15.__________is very clear to everyone that he's round and tall like a tree.16.
17..In the United States, bus travel doesn't cost much as train travel, ?18.