1.I doubt that we will make a profit out of it.
2.The girl is known as being honest.
3.The twins are very similar to appearance.
4.It was turned out that his statement was false.
5.Knowing who we are means to know how we think and we like to do.
6.I don't believe him,but I believe in him this time.
7.The poor is getting poorer and pooer,which is unfair.
8.West Lake is well known as its beautiful scenery.
9.Much to our surprise,his opinions are similar in ours.
10.The way which he worked out the math problem is very clever.
11.I meant ringing you,but I forgot.
12.After graduation,he asked to send to the place where he was needed.
13.People in big cities prefer to return to the nature.
14.All my money has used up,so we must go without food.
15.I observed the man to enter the bank with a shotgun.
16.He will give a speech on the history of the party.
17.There is not point in persuading her to go with us.
18.Seldom he goes out alone at night.

1.I doubt [whether] we will make a profit out of it.
2.The girl is known [for] being honest.
3.The twins are very similar [in] appearance.
4.It [] turned out that his statement was false.
5.Knowing who we are means [knowing] how we think and we like to do.
6.I don't believe [in ]him,but I believe[ ]him this time.
7.The poor [are] getting poorer and pooer,which is unfair.
8.West Lake is well known [for] its beautiful scenery.
9.Much to our surprise,his opinions are similar [to ]ours.
10.The way[ in ]which he worked out the math problem is very clever.
11.I meant [to ring] you,but I forgot.
12.After graduation,he asked to [be sent] to the place where he was needed.
13.People in big cities prefer [returning] to the nature.
14.All my money has [been] used up,so we must go without food.
15.I observed the man [entering] the bank with a shotgun.
16.He will [make] a speech on the history of the party.
17.There is[ no] point in persuading her to go with us.
18.He [seldom] goes out alone at night. [要麽就倒装]