Professor Lee failed many times but he ________found a good way to solve the problem.
Hearing his words,I couldn’t decide ______or remain.
The man we followed suddenly stopped and looked as if ______ whether he was going in the right direction.
Tom pretended______it but in fact,he knew it very well.
Without facts,we can’t form a correct opinion,for we need to have actual knowledge______our thinking.
The new coat looks too large on Mary,so her mother had to______.