—Do you think playing cards is beneficial to our study?—No,if ________,it can help us kill time when we have nothing to do.
I cannot______ puzzled,for I simply cannot understand how I could have made such a stupid mistake.
—What about the football match last night? —______.I might as well have stayed at home and had a good rest.
Since you have found it hard to learn Spanish,why not try ______foreign language?
If you are feeling so tired,perhaps a little sleep would ______.
Full of ______, he closed his eyes.