——Now lots of teenagers spend a lot of time playing computer games. ——Yes. Teachers and their parents should prevent them _____________

——Now lots of teenagers spend a lot of time playing computer games. ——Yes. Teachers and their parents should prevent them ______________ too much.

#50157

to play

play

plays

playing

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I often spend a lot of time ________ after class.

#49146

practicing play

to practice playing

to practice to play

practicing playing

My mother often tells me        late for class.

#49749

not be

not to be

am not

not

 I find it very hard ____ the question.

#50008

to answer

answers

answering

answered

---I am sorry to have kept you ___________.---It doesn't matter. I've just come.

#49688

wait

waited

waiting

to wait

        fit, she eats little every day.

#48662

Keep

Keeping

Keeps

In order to keep

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