No where else in the world__________more attractive scenery than iln switzerland． you can find。 is found。 can you find。 has been found。
--I think it’s going to be a big problem． ——Yes，it could be．I wonder__________we can do about it． if。 how。 what。 that。
In mose days she was always lost in tllought，so tllat she had to be called three of four times___________she came to her dinner． until。 after。 when。 before。
There are no lights on aIld no one aIlswers me doorbell．They___________be at home． must not。 will not。 should not。 can not。
She mought I was talking about her son___________acmaUy，I was talking a_bout my son． whom。 where。 wllich。 while。
After the argument Colin ran away and__________since．
