It is difficult to judge what words are _______ and what words are not．

worth to look up

worth being looked up

worth looking up

worthy of looking up

The teacher said that light _______ faster than sound．

has traveled

traveled

had traveled

travels

Internet should be developed to help people  _______ endanger people．

more than

other than

rather than

better than

Since there was a rapid increase in his business, his efforts _______．

paid in

paid off

paid back

paid for

There _______ many people _______ in the office, but now nobody is allowed to．

used to be；smoking

used to have；smoking

used to be；smoke

used to have；smoke

_______ I can see, there is only one possible way to keep away from the danger．

As long as

Just as

As far as

Even if

You should give the watch to Li Li．This watch is _______ she lost yesterday．

the same like

the same that

same as

the same as

Even on a cold day he prefers _______ out to play football _______ at home．

going; rather stay

going; to staying

to go; rather than staying

to do; rather than to stay

Zhang Hong is said _______ by heart 2000 words up to now．

that she has learned

to have learned

to learn

having learned

It doesn’t matter to me _______ I miss my train, because there’s another one later．

that

if

unless

when