Use the correct tense or form of the verbs in parentheses

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(13-16) Use the correct tense or form of the verbs in parentheses.
13/ I suggest
14/ Remember
elderly people. (help)
off the lights before going out. (turn)
the washing machine. ( fix)
by bike? ( travel)
15/ Get him
16/ What about
17-22) Use the correct form of the words in parentheses:
17/ The new machine he bought last week works
18/ Let's have an
19/
( effective)
mend the iron.( electric)
he finished his work. (ultimate)
20/ We should save our country's.
resources. (nature)
's main concern is quality of a new product. ( consume)
about my final exam. (worry)
21/
22/ I'm