—It is _______he often fails in exams_______ makes his parents worried about him.—So, he has to work whole-heartedly.
— The woman biologist stayed in Africa studying wild animals for 13 years before she returned. — Oh, dear ! She ______ a lot of difficulties !
Helen ______ go on the trip with us, but she isn’t quite sure yet.
The World Wide Web is sometimes jokingly called the World Wide Wait because it ______ be very slow.
— Tom is never late for work. Why is he absent today ? — Something _______ to him.
But for the help you gave me, I _______ the examinations.