His uncle went abroad in 2010, and _______since.
| A．has not been heard of | B．had not been heard of |
| C．had not heard of | D．has not heard of |
What ______ during a person's early years may affect the rest of his life.
| A．happened | B．has happened | C．happens | D．happening |
---You won’t go to Mary’s wedding party, will you?
---Yes, ______ invited to.
| A．even if | B．if | C．unless | D．though |
The plastic flowers look so ______ that many people think they are real.
| A．natural | B．familiar | C．beautiful | D．similar |
______ you understand it, it’s easy for you to obey it.
| A．As soon as | B．Once | C．Unless | D．The moment |
Don't trust such people ______ praise you to your face but speak ill of you behind your back.
| A．who | B．whoever | C．that | D．as |