We haven’t heard from Bill ______________ he left here.
| A．when | B．before | C．since | D．while |
Peter lives Singapore, but his sister lives here.
| A．in, / | B．in, in | C．at, in | D．/, in |
The young man are walking the park.
| A．across | B．cross | C．through | D．though |
Math is boring and difficult.
| A．of | B．too | C．any | D．some |
There are many teachers ______ in the apartment.
A. live B. lives C. living
—Where is my book , Dad? I can’t find it.
—Look! It’s on the desk. You must _____ .
A. put away it B. put it away C. put them away