1.
If they __ (do not eat) well, they __ (are not) healthy. 2.If __ (I
go) on a ferry, I always feel sick. 3.I __ (feel) very good the
following day if I __ (have) enough sleep. 4.If __ (I do not know) a
word, I __ (look) it up in my pocket dictionary. 5.They play
video-games if __ (they do not have) any homework. 6.If you bring the
temperature down, this water (turns) into ice. 7.She __ (likes) to
visit the museums if she __ (is) in a new country. 8.Vasya always __
(buys) expensive clothes if he __ (goes) shopping. 9.Tamara, our maths
teacher, gets angry if __ (we do not work) hard enough. 10.If you __
(press) this button here, the light __ (goes) on.