Question

by mistake,take place,by accident,all of a sudden,the number of

1.        newborn babies increases every year.

2. We woke up when the train stopped         .

3. The 2016 Olympic Games will        in Brazil.

4. I'm sorry I took your umbrella        yesterday.

5. Yesterday,my father met his old head teacher in the street       .He hasn't seen his teacher for years.

Answer 1

1. The number of  

2. all of a sudden

3. take place   4. by mistake   5. by accident