I owe my success to Mr. Smith, a teacher from America, ______ help I have greatly improved my oral English.

h having discussed it for long, they still haven’t reached an agreement ________ they should pour more money into the project

Lily, could you help to feed my cat while I’m away —__________.

It took me a lot of time ____ my homework.

I’m going to visit Yellow Mountain with my family this weekend.— ________.