— The woman biologist stayed in Africa studying wild animals for 13 years before she returned. — Oh, dear! She ______ a lot of difficulties!
Never in my life I forget the days ____we used to play together when we were children.
__seems easy to some people seems difficult to others .
The twins,______at birth,do not know each other .
______to looking after her sick father for 2 years ,she badly needed a holiday.
----Would you please give me a hand and take the bookcase upstairs? ---_______.