--- Why do you look so upset? --- There are so many troublesome problems ________

 --- Why do you look so upset? --- There are so many troublesome problems _________.

#89699

remaining to settle

remained settled

remaining to be settled

remained to be settled

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Do you know how much time and effort they devoted________ such a complicated project?

#94207

to complete

completed

completing

to completing

There goes the bell for the class.Let’s stop___.

#97763

to talk

to be talking

talked

talking

 ________ the meeting himself gave them a great deal of encouragement.

#89167

The president will attend

The president to attend

The president attended

The president's attending

The novel is said ____ into four languages.

#97874

to translate

to be translated

to have translated

to have been translated

It was _____ computer games that cost the boy a lot of time that he ought to have spent on his lessons.

#98837

to have played

playing

played

having played

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