Jane has been so ________ ingetting used to everything that she hasn’t had time for social activities. 

 You’d better fly somewhere in the west. Then you can _________ a hire car and travel around.

He left ______ with my secretary that he would call again in the afternoon.He said he would keep ______.

 After going into the concert hall, the mother _____ a friend and went over to greet him.

If you don’t try your best to learn all subjects, you will ___ behind.