Help me solve this passage

WORKING mothers
Carefully conducted (1)______ that have followed the children of working mothers have not been able to show any long-term problems, compared with children whose mothers stayed at home. My personal (2)_______ is that mothers should be allowed to work if they wish. Wherther we like it or not, there are a number of mothers who just have to work. There are those who have invested such a big part of their lives in establishing a career that they cannot afford to see it lost. Then there many who must work out of pure economic (3)________ .Many mothers are not (4)_______ out to be full-time parents.
After a few months at home with a much loved infant, they feel trapped and isolated.
There are a number of options when it (5)_______ to choosing childcare. These range from child minders and nannies throung to Granny or the kind lady (6)________ the street. (7)________ , however, many parents dont'n have any choice; they have to accept anything they can get. Be prepared! No matter how good the childcare may be, some children are going to protest wildly if they are left. This is a (8)_______ normal stage of child development. Babies separate well in the first six months, but soon after that they start to get crush on Mum and close family members. Make sure that in the first wwek you allow plenty of time to help your child settle in.
All children are different. Some are independent, while others are more attached to their mothers.
Remember that if you want to (9)_______ the best for your children, it's not the quantity of time you spend with them, it's the (10)_______ that matters.

1.A. researchers B. studies C. interviews D. questionnaires
2.A. view B. idea C. thought D. decision
3.A. reason B. duty C. necessity D. task
4.A. made B. cut C. brought D. born
5.A. refers B. concerns C. turns D. comes
6.A. of B. opposite C. across D. next to
7.A. In addition B. In fact C. In reality D. In contrast
8.A. perfectly B. extremely C. very D. certainly
9.A. make B. give C. have D. do
10.A. quality B. attitude C. behavior D. manner

I choose 1b,2a,3c,4b,5d,6c, 7c, 8a, 9d, 10a but the correction is 3a, 4d, 5a, 8d,10d. I don't understand. Please explain it to me. Thanks