— It’s getting dark, but Mr. Chen is till at his office. — No surprise. Who else can _______ he does.

Attention, coffee lovers! We have for you, the best coffee machine ___ invented.

—Do you often visit your friends?—________，because we are all busy with our jobs.

When it comes to a foreign language, he is not ________ quick a learner as his brother.

—What time do we have to be at the gate of the museum?  —______ the visitors begin to check in.