Fill in each of the blanks in the following sentences with a word or phrases chose from the Words & Phrases to Drill box. Change the forms where necessery.Words & Phrases to Drillabsorbacquaintanceassigncommandcommunicatecomplainconcentrate (on)constantdiligenceenlargeenvironmentfrequent(ly)handleneverthelessopportunityprocesspurchasereliablerely (on)sourcestrategysummarizeapart fromat a timebe bound toby no meanscommit .... to memoryfeel freefor instancein addition toin detailon a ... basisover and over againput into practiceseek outwatch out for4. At first, Tom found it difficult to ________ what his teachers said in class.