Use the correct form of the word in brackets to complete each sentence. 36. Waiting for exam results is a time of …………………………………... (anxious) 37. Their plan seemed to be …………………………………..possible. (theory) 38. Air …………………………………..is a big problem in many cities in the world. (pollute) 39. Both Nam and Hoa are stamp …………………………………... They share the same hobby. (collect) 40. His disappearance is very strange, in fact quite …………………………………... (explain) 41. I've made some ……………………………decisions this year, but all in all, I've done well. (question) 42. Burning coal is an ……………………………way of heating a house. Gasis much cheaper. (economy) 43. They have decided to organize the ………………………election by the end of this year. (president) 44. “This is not a good essay” said the lecture. “I find your arguments …………..………….” (convince) 45. The whole situation is not under control. They were …………………………………in meeting their objectives for the year. (succeed) Each of the following sentences has an error. Find the errors and correct them. 46. Had the teacher realized that the students couldn’t understand him, he would speak louder. 47. Some people often say that using cars is not so convenient than using motorbikes. 48. If you want to do a lot of progress, you need to try harder. 49. Millions of dead fish in Vietnam's shores raise industrial pollution fears. 50. Before she became a film star, she has been a stand up comedian.