It’s important for students to employ a word or a phrase according to the _____ in the language we study .
They made no effort to hide their amusement ________ I produced a packet of sweets from my pocket.
________ you stepped into the lab with your shoes on? You’re supposed to take them off before you enter it. I told you so!
The number of the people present at the concert ________ much smaller than expected. There ________ many tickets left.
It was not until I got home ________ I found my wallet missing.
Comrade Wang ________ be in Shanghai—I saw him in the company only a few minutes ago.