Нужно правельно соединить)заранее 1.catch up with a. to have a good relationship 2.fall behing b.to begin to do something as a pastime 3. get on with c. to work hard to do uncompleted work 4.look up d. to search for a piece of information 5.go on e.to fail to keep level with another 6.take up f. to continue.
1.catch up with - c. to work hard to do uncompleted work
2.fall behind - e.to fail to keep level with another
3. get on with - a. to have a good relationship
4.look up -d. to search for a piece of information
5.go on - f. to continue.
6.take up - b.to begin to do something as a pastime