— The woman biologist stayed in Africa studying wild animals for 13 years before she returned. — Oh, dear ! She ______ a lot of difficulties !
The box ____ two meters by two meters and ____ a ton.
It never occurred to humans until the mid-1990s ______ some animals can be cloned.
I’ll prepare more dishes_________ your guests decide to stay for dinner.
Large quantities of information, as well as some timely help _____ since the organization was built .
I am junior________my elder brother________four years.