Present simple or present continuous

1) sends
2) is writing
3) is looking for
4) attented
5) is...is preparing
6)always makes fun 
7) is not examining...he is giving a lecture....he usually examines
8) contains
9) you never tell...ask
10)Most oils boil
11) Are the musicians having lunch now? no they aren't.They are rehearsing in the...They are perfomong some new songs....
12)Do doctors use antibiotic drugs...No antibiotics drugs oesn't work against viruses. Doctors usually prescribe ...
13)Max is always playing pranks on his classmates!
14) Are you waiting for a ferry? Yes we are. The ferry arrives at four o'clock.
15)Are Peter and Tim going fishing next Thursday? Yes they are. they often go.....