Criticism and self-criticism _____ necessary _____ it helps us to correct mistakes.
You can hardly imagine the difficulty the woman hadher children.
Scientists are convincedthe positive effect of laughterphysical and mental health.
Playing basketball isgreat fun; it also provides us with a chance to develop our sense ofteam spirit.
It is hard to say what kind of person he is. Sometimes he is very friendly; at other times he ___ be very cold.
In my opinion, ___ matters is not one’s looks, but one’s inner thoughts.