Give the correct tense or form of the verbs in brackets

IV. Give the correct tense or form of the verbs in brackets(2ps).

a. Don't make noise now.My parents (take) ..(1)............................. their usual afternoon nap

b.While I (have) ..(2)............................. a bath, the telephone (ring)..(3)..................

c. He prefers (play)..(4)............... computer games to (read) ..(5)............... books.

d. Don't forget (lock) ..(6)................ the door before (go) ..(7)............. to bed 

e. I (write )..(8)........….. to my penpal 2 months ago, but I (not receive) …(9)…..........…….. his reply since then.

f. If we (not save) …(10)….........…… energy , there will be a shortage in the next century.