When first _________-to the host, Tom was moved by his kindness．

introducing

introduced

introduce

being introduced

When _________, the water changes into vapour．

heating

to heat

heated

is heated

I think _________ of him for his speaking loudly in the library．

well

bad

lowly

poor

In those days, political leaders were not _________．

think highly of

thought highly

thought highly of

thinking highly of

He pretended _________ his lunch, because he didn’t want to trouble her．

to have

having

having had

to have had

What else could you do but _________ nothing about it?

pretend to know

to pretend know

pretend knowing

to pretend to know

As time went by, the plan they stuck _________ fairly practical．

to proved

to proving

proved

to be proved

Although he has made such a stupid mistake, _________ his youth, let him be．

considering

to consider

we consider

considered

I should consider _________ in my duty if I did not take immediate action．

myself failing

me to

myself to

failing

Liu Xiang is considered the first Chin-ese _________ the gold medal in this match．

winning

won

having won

to win