I don’t think Jack is a man to be _____ when we are in trouble and need his help.

 You’d better not leave the football club. If you do, most probably you will not be ____ back in. 

We began to open to the outside world in the ate 1970s.        ,  there have been great changes in the country.

 I was giving a talk to a large group of people, the same talk I _______ to half a dozen other groups. 

If you want to travel in this city, you’d better rent a car. It is not easy to ________by bus here.