In the face of difficulties and drawbacks, we should learn to comfort ourselves and _______our high spirits all the time.

The stones each ________ as much as two tons.

75% of the students ______that the number of private cars _______ increasing rapidly.

The police will have to         the room for fingerprints. 

You can’t expect yourself to        his trust over the night because it takes time for the damage you have done to him to heal.