1: Ba enjoys going fishing with his brother 

=> Ba is keen..............................................

2: Learing a foreign language is very interesting

=> She hasn't............................................

3: She last wrotr to me three months ago

=> She hasn't...............................................

4: The test was too difficult for ú to do

=> The test was so ......................................................

5: He said "I am a doctor in Bach Mai hospital"

=> He said................................................................................

6: Work hard and you will pass your exam

=> If