Sincewehaveafocusedsubject，weshouldnottalk________.
A、atonce
B、athand
C、atintervals
D、atrandom
I‘vebeentellingyou_____nottodothat，butyounevelistenedtome.That’swhyyougotintotrouble.
A、attimes
B、timebeforetime
C、timeandagain
D、forthetimebeing
_______thatthescientistwillgiveusatalknextmonth?
A、Istrue
B、Isittrue
C、It’strue
D、It’struly
Bothofmybrothersarenowmarried，soIhavetwo_____.
A、sister-ins-law
B、sisters-in-law
C、sisters-in-law
D、sister-in-law
Sicknessoften_______eatingtoomuch.
A、asaresultof
B、resultof
C、resultin
D、resultfrom