Please help me anawer the questions!

14.He ______ to go to school.

A.is preparing B.preparing C.prepare D.are preparing

16.Sarah ______ a birthday card to her grandmother.

A.send B.were sending C.sending D.sent

17.I ______ to you before, you just did not hear me.

A.reply B.replying C.replies D.replied

18.I ______ to my doctor yesterday and he says I need more rest.

A.talk B.talks C.talking D.talked

19.Owen ______ his clothes after he fell into the sea.

A.changes B.changed C.change D.changing