Jack had traveled six miles across the Channel his engine failed and was forced to land on the sea .
| A．when | B．until | C．after | D．since |
—What are you going to do this afternoon?
— I will probably play computer games ________ my parents are out.
| A．as far as | B．as long as | C．even if | D．as if |
________ you’ve got two film tickets, you may as well invite Mary to go with you tonight.
A Now that B After all C Although D As soon as
In time of serious accidents，____we know some basic things about first aid，we can save lives.
A whether B. until C. if D unless
He tried his best to solve the problem，_____difficult it was.
A however B. no matter C. whatever D. although
Parents should take seriously their children's requests for sunglasses ____eye protection is necessary in sunny weather.
A because B. though C. unless D. if