mber of people invited ______ fifty, but a number of them______absent for different reasons

The boy’s dream was to have his own laboratory ________ to try out some of his own ideas.

下列各句中，没有语病的一句是（ ）

student of Senior Three, he has very little free time _________ he can spend developing his own interest.

Tom’s parents died when he was a child, so he was ______ by his relatives.