80. Our teacher usually ...................................................(give) us many exercises .
81. He often ........................................(catch) a train to work .
82. The cat ..........................................(catch) mouse .
83. They .....................................(plant) trees overthere at the moment .
84. My old friend , Manh ................................................(write) to me twice a month.
85. What she says ...........................................(be) true .
86. Where .....................................she......................................(buy) her breakfast every morning ?
87. Bien ...................................often...................................(not phone) to me .
88. Mrs . Green always ...................................(take) a bus to work . But now he .........................(drive ) to work .
89 . Look ! The ball ........................................(fall) down .