Fill in the gaps, using suitable prepositions. Parents are naturally anxious………………………………their children’s safety

U là tr, giúp với ạ ;-;"
V. Fill in the gaps, using suitable preposition. (1.0 point)

51. Parents are naturally anxious………………………………their children’s safety.

52. It’s very difficult……………………………….find work at the moment.

53. You can pay $200 …………………….and the rest in 12 monthly in installment.

54. Mary found it hard to concentrate ………………….. her work because of the noise.

55. Let these clothes be washed …………………. you have finished your homework.

56. The thieves went ……………… the old man with a knife.

57. It is better to try to work …………………… rather than against the boss.

58. In a consumer taste test, Coca-Cola went ……………….. against Pepsi.

59, 60. Detectives are hunting …………. thieves who broke …………….. a warehouse yesterday.