We wait until the traffic light turns green when we cross the road．（ ）
A．canB．mayC．must
I wonder．
Yes，of course．（ ）
A．why we will visit this museum
B．when we will get to the museum
C．whether the museum is worth visiting
D．what we can see in the museum
In Switzerland，things like glass and plastic into different groups and then recycled（ ）
A．separateB．separated
C．are separatedD．is separated
Watch out，Peter! is a little boy playing ahead on the road．（ ）
A．ItB．ThisC．ThatD．There
My grandma's hobby is cooking watching TV，It's square dancing （ ）
A．not only；but alsoB．neither；nor
C．both；andD．either；or
It seems that El Nino some disasters in the world in the past few months （ ）
A．has causedB．is causingC．will causeD．caused