I called you up last night but I couldn’t _____________.
The young man stopped and looked back as if ______ whether he was being followed.
The patient’s dangerous condition ____the doctors and nurses many a sleepless night.
______ down on the ground, he struggled to his feet and held up his head, _______his enemy.
----Can I look at the menu for a few more minutes before I decide? ----Of course. ______, sir.
Premier Wen advocated school bus safety_______.